Jesus never promised to return, not once in the NT. It was the Christians who *believed* that he would return.
Are you sure you don't know much about the NT? And, you don't have time to read it... let alone study it? Anyway, this is Revelation 22. For Bible-believing Christians, which you and I are not, it implies Jesus is coming back.
Rev 22:1 Then the angel showed me the river of the water of life, as clear as crystal, flowing from the throne of God and of the Lamb
2 down the middle of the great street of the city. On each side of the river stood the tree of life, bearing twelve crops of fruit, yielding its fruit every month. And the leaves of the tree are for the healing of the nations.
3 No longer will there be any curse. The throne of God and of the Lamb will be in the city, and his servants will serve him.
Who is the Lamb? For Christians it is Jesus. For Baha'is? What do you think?
4 They will see his face, and his name will be on their foreheads.
5 There will be no more night. They will not need the light of a lamp or the light of the sun, for the Lord God will give them light. And they will reign for ever and ever.
6 The angel said to me, “These words are trustworthy and true. The Lord, the God who inspires the prophets, sent his angel to show his servants the things that must soon take place.”
7 “Look, I am coming soon! Blessed is the one who keeps the words of the prophecy written in this scroll.”
Who is coming soon? I don't know of anybody that came soon. Baha'is believe Muhammad was the next manifestaton and that wasn't until 600 years later. If this is Baha'u'llah, he didn't come until almost 2000 years later.
8 I, John, am the one who heard and saw these things. And when I had heard and seen them, I fell down to worship at the feet of the angel who had been showing them to me.
9 But he said to me, “Don’t do that! I am a fellow servant with you and with your fellow prophets and with all who keep the words of this scroll. Worship God!”
10 Then he told me, “Do not seal up the words of the prophecy of this scroll, because the time is near.
Don't seal these words, because the time is near? What was near? The end times? The return of the Christ Spirit? What?
11 Let the one who does wrong continue to do wrong; let the vile person continue to be vile; let the one who does right continue to do right; and let the holy person continue to be holy.”
12 “Look, I am coming soon! My reward is with me, and I will give to each person according to what they have done.
13 I am the Alpha and the Omega, the First and the Last, the Beginning and the End.
14 “Blessed are those who wash their robes, that they may have the right to the tree of life and may go through the gates into the city.
15 Outside are the dogs, those who practice magic arts, the sexually immoral, the murderers, the idolaters and everyone who loves and practices falsehood.
16 “I, Jesus, have sent my angel to give you this testimony for the churches. I am the Root and the Offspring of David, and the bright Morning Star.”
Apparently Jesus is speaking now? How? Through the angel? But anyway, It says "I, Jesus"
17 The Spirit and the bride say, “Come!” And let the one who hears say, “Come!” Let the one who is thirsty come; and let the one who wishes take the free gift of the water of life.
18 I warn everyone who hears the words of the prophecy of this scroll: If anyone adds anything to them, God will add to that person the plagues described in this scroll.
19 And if anyone takes words away from this scroll of prophecy, God will take away from that person any share in the tree of life and in the Holy City, which are described in this scroll.
20 He who testifies to these things says, “Yes, I am coming soon.”Amen. Come, Lord Jesus.
21 The grace of the Lord Jesus be with God’s people. Amen.
It says "I am coming soon"? Christians usually say that in God's time a couple thousand years isn't very long, so to God, it is still "soon". For Baha'is, Muhammad came and went, then The Bah, then Baha'u'llah. You believe in 3 "coming soons." But in verse 20 it sounds like whoever this John is that received this prophecy cuts in and says, "Come, Lord Jesus"? Why would he say that? Why would he think that? For Christians, no problem, Jesus is alive and coming back... someday. For Baha'is, how do you explain why the person receiving this vision and prophecy thought it would be Jesus coming back?