John 1:29-31

Amplified Bible

²⁹The next day he saw Jesus coming to him and said, “Look! The Lamb of God ^[a]who takes away the sin of the world!^(A) ³⁰This is He on behalf of whom I said, ‘After me comes a Man who has a higher rank than I and has priority over me, for He existed before me.’ ³¹^[b]I did not recognize Him [as the Messiah]; but I came baptizing ^[c]in water so that He would be [publicly] revealed to Israel.”

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Footnotes

John 1:29 John is referring to the fulfillment of the need for the OT Passover lambs which was now fulfilled in Christ’s sacrifice, the ultimate and final sacrifice for sins.
John 1:31 John the Baptist and Jesus were related through their mothers, Elizabeth and Mary, but He was unknown as the Messiah until God revealed it to John at the beginning of Jesus’ ministry.
John 1:31 The Greek here can be translated in, with or by.