John 1:31

And I did not know Him, but in order that He may be made manifest to Israel, on this account I came baptizing with water.

Luke 1:17

And he will go before Him in the spirit and Power of Elijah, to turn the hearts of the fathers to the children, and the disobedient unto the understanding of the righteous, to prepare a people made ready for the Lord.

Matthew 3:6

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

Mark 1:3-5

the voice of one roaring in the wilderness; Prepare ye the way of the Lord; make His paths straight.

Luke 1:76-80

And thou, little child, shall be called a prophet of the Highest; for thou shalt go before the face of the Lord to prepare His ways,

Luke 2:39-42

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

Luke 3:3-4

And he came into all the region round about the Jordan preaching the baptism of repentance unto the remissions of sins,

John 1:7

The same came for a witness, that he might bear witness concerning the light, in order that all through him might believe.

John 1:33

And I did not know Him, but the One having sent me to baptize with water, He said to me, On whom you may see the Spirit descending and remaining on Him, He is the one baptizing with the Holy Ghost.

Acts 19:4

And Paul said, John baptized with the baptism of repentance, saying unto the people, that they should believe on the one coming after him, that is 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 did not know Him, but the One having sent me to baptize with water, He said to me, On whom you may see the Spirit descending and remaining on Him, He is the one baptizing with the Holy Ghost.
Luke 1:80
And the little child continued to grow and waxed strong in spirit; and was in the deserts until the day of his showing unto Israel.
Luke 2:39
And when they finished all things according to the law of the Lord, they returned into Galilee into their own city Nazareth.

But

John 1:7
The same came for a witness, that he might bear witness concerning the light, in order that all through him might believe.
Luke 1:17
And he will go before Him in the spirit and Power of Elijah, to turn the hearts of the fathers to the children, and the disobedient unto the understanding of the righteous, to prepare a people made ready for the Lord.

Therefore

Matthew 3:6
and were being baptized by him in the river Jordan, confessing their sins.
Mark 1:3
the voice of one roaring in the wilderness; Prepare ye the way of the Lord; make His paths straight.
Luke 3:3
And he came into all the region round about the Jordan preaching the baptism of repentance unto the remissions of sins,
Acts 19:4
And Paul said, John baptized with the baptism of repentance, saying unto the people, that they should believe on the one coming after him, that is Jesus.