Luke 3:2-6 (NASB)

2 in the high priesthood of Annas and Caiaphas, the word of God came to John, the son of Zacharias, in the wilderness. 3 And he came into all the district around the Jordan, preaching a baptism of repentance for the forgiveness of sins; 4 as it is written in the book of the words of Isaiah the prophet,

“The voice of one crying in the wilderness,
‘Make ready the way of the Lord,
Make His paths straight.
5 ‘Every ravine will be filled,
And every mountain and hill will be brought low;
The crooked will become straight,
And the rough roads smooth;
6 And all flesh will see the salvation of God.’”