'I Am Not Worthy' in the Bible

John answered to all, saying, I truly immerse you with water; and he stronger than I comes, of whom I am not worthy to loose his shoes' strings: he shall immerse you with the Holy Spirit and fire:

This is he coming after me, who was before me, of whom I am not worthy that I might loose the strings of his shoes.

And as John completed the course, be said, Whom think ye me to be? I am not. But, behold, he comes after me, whose shoes of the feet I am not worthy to loose.