Peace be on you.
Bahai and Ahmadiyyas are different.
Ahmadiyyas are nothing but Muslims.
Holy Quran and Holy Prophet (s.a.w.) made prophecy for reformation of Latter days.
Some lost hope
Some said he will comes.
Ahmadiyya Muslims said he has come.
Next the question of his status.
Those who wait say he will be previous Prophet.
Ahmadiyya Muslims believe previous Prophets do not come. It is only title. Holy Quran in Surah Jumua (ch 62) said:
[ch62:v3] He it is Who has raised among the Unlettered
people a Messenger from among themselves who recites unto them His verses, and purifies them, and teaches them the Book and wisdom, although they had been, before, in manifest misguidance;
[ch62:v4]And
among others from among them, who have not yet joined them. He is the Mighty, the Wise.
ABOUT THE VERSE (62:4)
The Companion Abu Hurairah (may Allah be pleased with him) said:
One day we were sitting with Holy Prophet when Surah Jumua was revealed. I enquired from the Holy Prophet, Who are the people to whom the words,
'And among others who have not yet joined them' Salman, the Persian was sitting among us. Upon my repeated asking him the same question the Holy Prophet put his hand on Salman and said, 'If faith were to go up to the Pleiades, a man from these would surely find it.'
[Ref: Book of Hadith, Bukhari]
And Hadith of Muslim, Holy Prophet (s.a.w.) said four time Esa Nabiullah's coming.
Two Ahadith in Bukhari mentions two different men as Esa ibne Maryam (Jesus);
a)-one was reddish with curly hairs (in Mairaj - ascension, obviously it was first Esa a.s. and b)-other as brownish skin straight hairs circuiting around Kaaba after Dajjal
Mahdi is none but Esa. [Ibne Majah]
Thus all this from Quran and Hadith amounts to following:
1- The latter days' reformer is lost in love of Holy Prophet (s.a.w.) as subordinate Prophet.
2- He will defend Islam against anti truth forces (Dajjal).
3- He is like Jesus a.s. (who came after 1400 years of Moses a.s.), he came 1400 years after Muhammad (s.a.w.)
4- He is Mahdi too, i.e. guided by Allah.
5- He is beloved servant devotee of Hazrat Muhammad (s.a.w.)
Ahmadiyya Muslims believe that Holy Prophet Muhammad (s.a.w.) is
The Chief and Last Prophet of Last Shariah and he (s.a.w.) is unique that his (s.a.w.) light can make subordinate Prophets to serve his cause, as Holy Quran tells, which is blessings asked in Surah Al Fateha:
[1:6] Guide us in the right path —
[1:7] The path of those on whom Thou hast bestowed
Thy blessings, those who have not incurred
Thy displeasure, and those who have not gone astray.
The top most blessing is Prophethood according to Quran, next are Truthful, Martyrs then Righteous.
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The difference between true and false Prophets and Priests @
Secular Viewpoints Examined
wwwDOTalislamDOTorg/library/books/revelation/part_3_section_1.html
