Matthew 3:6
"And were baptized of him in Jordan, confessing their sins."Matthew 3:6 (KJV)
Context from Matthew 3
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And the same John had his raiment of camel’s hair, and a leathern girdle about his loins; and his meat was locusts and wild honey.
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Then went out to him Jerusalem, and all Judaea, and all the region round about Jordan,
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And were baptized of him in Jordan, confessing their sins.
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But when he saw many of the Pharisees and Sadducees come to his baptism, he said unto them, O generation of vipers, who hath warned you to flee from the wrath to come?
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Bring forth therefore fruits meet for repentance: