Quote from Gospels:
“If you love me, keep my commands. 16 And I will ask the Father, and he will give you another advocate to help you and be with you forever— 17 the Spirit of truth. The world cannot accept him, because it neither sees him nor knows him. But you know him, for he lives with you and will be in you. 18 I will not leave you as orphans; I will come to you. 19 Before long, the world will not see me anymore, but you will see me. Because I live, you also will live. 20 On that day you will realize that I am in my Father, and you are in me, and I am in you. 21 Whoever has my commands and keeps them is the one who loves me. The one who loves me will be loved by my Father, and I too will love them and show myself to them.”
22 Then Judas (not Judas Iscariot) said, “But, Lord, why do you intend to show yourself to us and not to the world?”
23 Jesus replied, “Anyone who loves me will obey my teaching. My Father will love them, and we will come to them and make our home with them. 24 Anyone who does not love me will not obey my teaching. These words you hear are not my own; they belong to the Father who sent me.
25 “All this I have spoken while still with you. 26 But the Advocate, the Holy Spirit, whom the Father will send in my name, will teach you all things and will remind you of everything I have said to you. 27 Peace I leave with you; my peace I give you. I do not give to you as the world gives. Do not let your hearts be troubled and do not be afraid.
28 “You heard me say, ‘I am going away and I am coming back to you.’ If you loved me, you would be glad that I am going to the Father, for the Father is greater than I. 29 I have told you now before it happens, so that when it does happen you will believe. 30 I will not say much more to you, for the prince of this world is coming. He has no hold over me, 31 but he comes so that the world may learn that I love the Father and do exactly what my Father has commanded me.
“Come now; let us leave.
Holy spirit in hadiths:
(In al-Kafi al-Kulayni reports) with his isnad from Abu Basir that he said, "I asked Abu 'Abd Allah, may peace be upon him, concerning the statement of God, the Blessed and the Exalted, 'And thus have We inspired in thee (O Muhammad) a Spirit of Our Command. Thou knewest not what the Scripture was, nor what the Faith' (42:52). He replied, '(The Spirit mentioned in the verse) is one of the creatures of God, the Blessed and the Exalted, greater than Gabriel and Michael, that was with the Messenger of God, may God bless him and his Household, and which used to inform and guide him, and after him it is with the Imams, may God bless them."
Al-Husayn has narrated from (Muhammad) ibn ‘Abdallah from Muhammad ibn Sinan from al-Mufaddal from Jabir ibn Yazid who has said the following. "Abu Ja‘far (a.s.) said to me, ‘O Jabir, the first thing that Allah created was Muhammad (s.a) and his offspring who are the rightly guided guides. They existed in ’Ashabah (form ) of light in the presence of Allah." I then asked, "What is ’Ashabah?" The Imam (a.s.) said, "It is the shadow of light, the lighting bodies without the spirit. It was supported by one spirit which is the Holy spirit. In that state he and his offspring worshipped Allah and for this reason He created them forbearing scholars, conscientious pure one who worship Allah through prayer, fasting, prostration, speaking of His Glory and the acknowledgment that He is the only Lord. They perform prayers, perform Hajj and fast
And also the following is interesting:
[in al-Kafi (al-Kulayni reports) with his isnad from Jabir, from Abu Ja'far, may peace be upon him. Jabir says: "I asked him concerning the knowledge of the Knowing One (al-'Alim, i.e an Imam). He replied saying, 'O Jabir, verily, there are five spirits in the prophets and the awsiya': the Holy Spirit, the Spirit of Faith, the Spirit of Life, the Spirit of Power, and the Spirit of Appetite. By the means of the Holy Spirit, O Jabir, they know everything from the Throne to underneath the earth.' Then he added, 'O Jabir, all the four spirits are subject to vicissitudes, but not the Holy Spirit, which does not engage in diversion or play."
In Du'a from Imam Mahdi (a) against black magic, we read:
"And save my spirit with your holy spirit that which who those saves through becomes great in the eyes of the onlookers and big in the hearts of all creation".
From Al-Kafi:
Ali ibn Ibrahim has narrated from his father from ibn abu ‘Umayr from ‘Umar ibn ’Udhayna from Fudayl ibn Yasar who has said that he heard abu ‘Abdallah say the following to some of the companions of Qays al-Masir. "Allah, the Most Holy, the Most High, discipline and education His Messenger. He then made his discipline and education to be the best. When his discipline and education was complete He said, "O Muhammad, you certainly possess a great degree of moral discipline and education. (64:4). Then He made him in charge of the affairs of the religion and the nation (Muslim) so he would manage the social matters of the His servants with wisdom. Allah, the Most Holy, the Most High, said, ". . .what the Messenger (of Allah) you, you must take (obey) and what he prohibits you, you must desist from. . ." (59:7) The Messenger of Allah was protected, successful and supported by the Holy Spirit. He (the Messenger of Allah) does not slip, make a mistake in any of the matters of the management of the social matters of the creatures. He is educated with the education of Allah. Allah, the Most Holy, the Most High, commanded to perform the prayer in two and two Rak‘at form totalling ten Rak‘ats. The Messenger of Allah added two more Rak‘ats to each prayer and only one Rak‘at to the Maghrib prayer (the prayer at sun set). Such additions became just as the obligatory ones and it is not permissible to disregard them. They are obligatory at home and on a journey. Allah, the Most Holy, the Most High, granted him permission in all of it. Thus, the obligatory prayers became seventeen Rak‘ats. The Messenger of Allah then setup the tradition of optional prayers totaling thirty four Rak‘ats which is double the number of the optional prayers. Allah, the Most Holy, the Most High, granted him permission for this. All the optional and obligatory prayers total fifty one Rak‘ats of which there is two Rak‘ats in a sitting position after (al-‘atma) ‘Isha prayer which is counted as one Rak‘at in place of Witr. Allah made fasting of the month of Ramadan obligatory which comes only once in a year. The Messenger of Allah set up the tradition of fasting in the month of Sha‘ban and three days fasting of every month and the number of days in it totals twice as much as the obligatory fast. Allah, the Most Holy, the Most High, granted him permission for all of this. Allah, the Most Holy, the Most High, made just wine unlawful to consume. The Messenger of Allah pronounced all intoxicants drinks unlawful. Allah, the Most Holy, the Most High, granted him permission in this case also. The Messenger of Allah pronounced certain things as permissible and pronounced other things as detestable but did not declare them prohibited as unlawful. He only pronounced them prohibited in a permissible prohibition and detestable. He then spoke of such prohibitions as permissible but then such permissible matters became obligatory for the servants (of Allah) like the obligation of abiding by what is prohibited and determined. The Messenger of Allah did not grant permission in the matters that were prohibited as unlawful (to violate) prohibitions or what he pronounced as an order to follow as an obligation and binding. A great deal of the intoxicants drinks he pronounced as unlawful to consume and he did not grant permission to any one to consume them. The Messenger of Allah did not grant permission to anyone to further shorten the prayers tha consisted of two Rak‘ats that were added to what Allah, the Most Holy, the Most High, had made obligatory. In fact, He made them binding and necessary like an obligation. He did not grant permission to anyone in this matter except those on a journey. No one has the right to give permission in such issues until the Messenger of Allah grants permission. Thus, the order of the Messenger of Allah concord the orders of Allah, the Most Holy, the Most High. The prohibitions of the Messenger of Allah concord the prohibition of Allah, the Most Holy, the Most High. It has become obligatory for the servants (of Allah) to submit to his commands as it is obligatory for them to submit to the command of Allah, the Most Holy, the Most High.
Muhammad has narrated from Ahmad ibn Muhammad from ibn Mahbub from Hisahm ibn Salim from ‘Ammar al-Sabati who has said the following. "Once I asked abu ‘Abdallah (a.s.), "By what means do you judge when you would judge?" He said, "We judge by the laws of Allah and in the manner of David. If an issue would come before us for which there is nothing with us the Holy Spirit provides us inspiration."
My comment: We see Imams (a) are all instances of the holy spirit or rather the holy spirit is one and the same reality in all of them.
The other type of spirits differ Imam to Imam, and they differ in the outward descent, but at the highest reality, their spirit is one and the same, and it's called "the light of God" "the name of God" or the "the holy spirit" or the "the spirit from his Authority/Command"
And this is the most simplest and easiest way to interpret Jesus (a) words about the advocate/comforter/praised one, that he too is the holy spirit just like Jesus (a) was, and the one between him and that, is Elijah (a). I will talk about Elijah (a) in the Gospels later and the Quranic correction, John (a) is not the return of Elijah (a) rather that Elijah (a) did return and was the Light of the world till Mohammad (s).