John 1:31

I myself did not recognize him; I only came to baptize with water, in order that he might be disclosed to Israel."

Luke 1:17

he will go in front of Him with the spirit and power of Elijah to turn the hearts of fathers to their children, turning the disobedient to the wisdom of the just, to make a people ready and prepared for the Lord."

Matthew 3:6

and got baptized by him in the Jordan, confessing their sins.

Mark 1:3-5

the voice of one who cries in the desert, 'Make the way ready for the Lord, level the paths for him' ??4 John appeared baptizing in the desert and preaching a baptism of repentance for the remission of sins;

Luke 1:76-80

And you, my child, shall be called a prophet of the Most High; for you shall go in front of the Lord to make his ways ready,

Luke 2:39-42

When they had finished all the regulations of the law of the Lord, they returned to Galilee, to their own town of Nazaret.

Luke 3:3-4

and he went into all the Jordan-district preaching a baptism of repentance for the remission of sins ??4 as it is written in the book of the sayings of the prophet Isaiah, The voice of one who cries in the desert, 'Make the way ready for the Lord, level the paths for him.

John 1:7

he came for the purpose of witnessing, to bear testimony to the Light, so that all men might believe by means of him.

John 1:33

I myself did not recognize him, but He who sent me to baptize with water told me, 'He on whom you see the Spirit descending and resting, that is he who baptizes with the holy Spirit.'

Acts 19:4

"John," said Paul, "baptized with a baptism of repentance, telling the people to believe in Him who was to come after him, that is, in Jesus."

Treasury of Scripture Knowledge

Summary

And I knew him not: but that he should be made manifest to Israel, therefore am I come baptizing with water.

Bible References

I knew

John 1:33
I myself did not recognize him, but He who sent me to baptize with water told me, 'He on whom you see the Spirit descending and resting, that is he who baptizes with the holy Spirit.'
Luke 1:80
And the child grew, he became strong in the Spirit and remained in the desert till the day when he made his appearance before Israel.
Luke 2:39
When they had finished all the regulations of the law of the Lord, they returned to Galilee, to their own town of Nazaret.

But

John 1:7
he came for the purpose of witnessing, to bear testimony to the Light, so that all men might believe by means of him.
Luke 1:17
he will go in front of Him with the spirit and power of Elijah to turn the hearts of fathers to their children, turning the disobedient to the wisdom of the just, to make a people ready and prepared for the Lord."

Therefore

Matthew 3:6
and got baptized by him in the Jordan, confessing their sins.
Mark 1:3
the voice of one who cries in the desert, 'Make the way ready for the Lord, level the paths for him' ??4 John appeared baptizing in the desert and preaching a baptism of repentance for the remission of sins;
Luke 3:3
and he went into all the Jordan-district preaching a baptism of repentance for the remission of sins ??4 as it is written in the book of the sayings of the prophet Isaiah, The voice of one who cries in the desert, 'Make the way ready for the Lord, level the paths for him.
Acts 19:4
"John," said Paul, "baptized with a baptism of repentance, telling the people to believe in Him who was to come after him, that is, in Jesus."