The Bible says it will come through Christ establishing his Kingdom rulership on earth.
Jesus taught us to pray for God's kingdom to "come" and for his will to "be done on earth as it is in heaven". This will be God's doing, not man's. (Daniel 2:44)
Yes, it was to be God's doing, since it was God who brought it about., but humans will complete the work of building the Kingdom of God on earth.
“God’s purpose is none other than to usher in, in ways He alone can bring about, and the full significance of which He alone can fathom, the Great, the Golden Age of a long-divided, a long-afflicted humanity. Its present state, indeed even its immediate future, is dark, distressingly dark. Its distant future, however, is radiant, gloriously radiant—so radiant that no eye can visualize it......”
The Promised Day is Come, p. 116
God’s Purpose
Where will I find another manifestation of God mentioned in scripture?
I am not sure all the places they are mentioned, but here are some places that Muhammad, the Bab and Baha’u’llah were all prophesied in the Bible...
“The second woe is past; and, behold, the third woe cometh quickly.” (Rev. 11:14) The first woe is the appearance of the Prophet, Muhammad, the son of ‘Abdu’lláh—peace be upon Him! The second woe is that of the Báb—to Him be glory and praise! The third woe is the great day of the manifestation of the Lord of Hosts and the radiance of the Beauty of the Promised One. The explanation of this subject, woe, is mentioned in the thirtieth chapter of Ezekiel, where it is said:
“The word of the Lord came again unto me, saying, Son of man, prophesy and say, Thus saith the Lord God; Howl ye, Woe worth the day! For the day is near, even the day of the Lord is near.” (Ez. 30:1-3)
Therefore, it is certain that the day of woe is the day of the Lord; for in that day woe is for the neglectful, woe is for the sinners, woe is for the ignorant. That is why it is said, “The second woe is past; behold the third woe cometh quickly!” This third woe is the day of the manifestation of Bahá’u’lláh, the day of God; and it is near to the day of the appearance of the Báb.
“And the seventh angel sounded; and there were great voices in heaven, saying, The kingdoms of this world are become the kingdoms of our Lord, and of His Christ; and He shall reign for ever and ever.” (Rev. 11:15).”
“And I will give power unto my two witnesses, and they shall prophesy a thousand two hundred and three-score days, clothed in sackcloth.” (Rev. 11:3). These two witnesses are Muhammad the Messenger of God, and ‘Alí, son of Abú Tálib.
In the Qur’án it is said that God addressed Muhammad, the Messenger of God, saying: “We made You a Witness, a Herald of good news, and a Warner”—that is to say, We have established Thee as the witness, the giver of good tidings, and as One bringing the wrath of God. The meaning of “a witness” is one by whose testimony things may be verified. The commands of these two witnesses were to be performed for twelve hundred and sixty days, each day signifying a year. Now, Muhammad was the root, and ‘Alí the branch, like Moses and Joshua. It is said they “are clothed in sackcloth,” meaning that they, apparently, were to be clothed in old raiment, not in new raiment; in other words, in the beginning they would possess no splendor in the eyes of the people, nor would their Cause appear new; for Muhammad’s spiritual Law corresponds to that of Christ in the Gospel, and most of His laws relating to material things correspond to those of the Pentateuch. This is the meaning of the old raiment.
Some Answered Questions, 11: COMMENTARY ON THE ELEVENTH CHAPTER OF THE REVELATION OF ST. JOHN
Jesus said he was going to return and rectify all that is wrong with life on this planet.
Don't Baha'i's believe that this has already taken place?
How is he to come again? Why will he need to?
Bahais believe this has already taken place because we believe that Baha'u'llah was the seventh angel, as referenced above:
“And the seventh angel sounded; and there were great voices in heaven, saying, The kingdoms of this world are become the kingdoms of our Lord, and of His Christ; and He shall reign for ever and ever.” (Rev. 11:15).”
So no, we do not believe that Jesus will come again, what would be the point?
Jesus did not say that He would come and rectify it; Jesus said he would send
another Comforter and
the Spirit if truth to rectify it.
John 16 King James Version (KJV)
7 Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you.
8 And when he is come, he will reprove the world of sin, and of righteousness, and of judgment:
9 Of sin, because they believe not on me;
10 Of righteousness, because I go to my Father, and ye see me no more;
11 Of judgment, because the prince of this world is judged.
12 I have yet many things to say unto you, but ye cannot bear them now.
13 Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come.
14 He shall glorify me: for he shall receive of mine, and shall shew it unto you.
15 All things that the Father hath are mine: therefore said I, that he shall take of mine, and shall shew it unto you.