John 1:29-37 NKJV
The next day John saw Jesus coming toward him, and said, “Behold! The Lamb of God who takes away the sin of the world! This is He of whom I said, ‘After me comes a Man who is preferred before me, for He was before me.’ I did not know Him; but that He should be revealed to Israel, therefore I came baptizing with water.”
And John bore witness, saying, “I saw the Spirit descending from heaven like a dove, and He remained upon Him. I did not know Him, but He who sent me to baptize with water said to me, ‘Upon whom you see the Spirit descending, and remaining on Him, this is He who baptizes with the Holy Spirit.’ And I have seen and testified that this is the Son of God.”
Again, the next day, John stood with two of his disciples. And looking at Jesus as He walked, he said, “Behold the Lamb of God!”
The two disciples heard him speak, and they followed Jesus.
NKJV: New King James Version