ANSWER: The Spirit descended on Jesus from heaven as he was baptized!

John the Baptist knew it was Jesus because when John baptized Jesus, John saw the Holy Spirit descending on Jesus like a dove. John the Baptist had been baptizing people for a while in the Jordan River when Jesus came along.

 

According to the Bible: “The next day, John saw Jesus coming to him and he saith: Behold the Lamb of God, behold him who taketh away the sin of the world. This is he of whom I said: After me there cometh a man, who is preferred before me: because he was before me. . .that he may be made manifest in Israel, therefore am I come baptizing with water.. ..And I knew him not; but he who sent me to baptize with water, said to me: He upon whom thou shalt see the Spirit descending, and remaining upon him, he it is that baptizeth with the Holy Ghost. And I saw, and I gave testimony, that this is the Son of God" (John 1:20-34).

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