John 1:31

And I knew him not; but that he might be made manifest to Israel, therefore I came baptizing in water.

Luke 1:17

And he will go before his face in the spirit and power of Elijah, to turn the hearts of fathers to children, and the disobedient to the wisdom of the righteous, to make ready for the Lord a prepared people.

Matthew 3:6

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

Mark 1:3-5

"The voice of one crying in the wilderness, Prepare the way of the Lord, make straight his paths!"

Luke 1:76-80

And thou, child, shalt be called a prophet of the Most High; for thou shalt go in advance before the face of the Lord to prepare his ways,

Luke 2:39-42

And when they had performed all things according to the law of the Lord, they returned to Galilee, to their own city Nazareth.

Luke 3:3-4

And he came into all the country about the Jordan, preaching the baptism of repentance for the remission of sins;

John 1:7

He came as a witness, to bear witness of the light, that through him all might believe.

John 1:33

And I knew him not; but he who sent me to baptize in water, the same said to me, Upon whom thou shalt see the Spirit descending and abiding on him, he it is that baptizeth in the Holy Spirit.

Acts 19:4

Then said Paul, John indeed baptized with the baptism of repentance, saying to the people, that they should believe on him that was coming after him; that is, on 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
And I knew him not; but he who sent me to baptize in water, the same said to me, Upon whom thou shalt see the Spirit descending and abiding on him, he it is that baptizeth in the Holy Spirit.
Luke 1:80
And the child grew, and waxed strong in spirit; and was in the deserts till the day of his manifestation to Israel.
Luke 2:39
And when they had performed all things according to the law of the Lord, they returned to Galilee, to their own city Nazareth.

But

John 1:7
He came as a witness, to bear witness of the light, that through him all might believe.
Luke 1:17
And he will go before his face in the spirit and power of Elijah, to turn the hearts of fathers to children, and the disobedient to the wisdom of the righteous, to make ready for the Lord a prepared people.

Therefore

Matthew 3:6
and were baptized by him in the river Jordan, confessing their sins.
Mark 1:3
"The voice of one crying in the wilderness, Prepare the way of the Lord, make straight his paths!"
Luke 3:3
And he came into all the country about the Jordan, preaching the baptism of repentance for the remission of sins;
Acts 19:4
Then said Paul, John indeed baptized with the baptism of repentance, saying to the people, that they should believe on him that was coming after him; that is, on Jesus.