'I Am Not Worthy' in the Bible

I indeed baptize you with water unto repentance: but he that is coming after me is mightier than I, whose sandals I am not worthy to carry: he shall baptize you with the Holy Spirit, and with fire:

And he preached, saying, One mightier than I is coming after me, the string of whose shoes I am not worthy, stooping down, to unloose.

John addressed himself to them all, saying, I indeed baptise you with water; but one mightier than I is coming, the thong of whose sandals I am not worthy to untie: he shall baptise you with the Holy Ghost and with fire;

it is he, though coming after me, who was before me, the thong of whole sandal I am not worthy to untie.

But as John was finishing his course, he said, Whom do ye suppose me to be? I am not [the Messiah]. But, behold! he is coming after me, the sandals of whose feet I am not worthy to loose.