The Birth of Saint John the Baptist: "The LORD called me from birth, from my mother’s womb he gave me my name."

"It is too little, he says, for you to be my servant,
to raise up the tribes of Jacob,
and restore the survivors of Israel;
I will make you a light to the nations,
that my salvation may reach to the ends of the earth."

Is 49:1-6

When the time arrived for Elizabeth to have her child
she gave birth to a son.
Her neighbors and relatives heard
that the Lord had shown his great mercy toward her,
and they rejoiced with her.
When they came on the eighth day to circumcise the child,
they were going to call him Zechariah after his father,
but his mother said in reply,
“No. He will be called John.”

Lk 1:57-66, 80

St. John the Baptist is the Lord's immediate precursor or forerunner, sent to prepare his way. "Prophet of the Most High", John surpasses all the prophets, of whom he is the last. He inaugurates the Gospel, already from his mother's womb welcomes the coming of Christ, and rejoices in being "the friend of the bridegroom", whom he points out as "the Lamb of God, who takes away the sin of the world". Going before Jesus "in the spirit and power of Elijah", John bears witness to Christ in his preaching, by his Baptism of conversion, and through his martyrdom.

CCC 523