NT.filter - nkjv strap:

nkjv@Mark:1:7 @ And he preached, saying, "There comes One after me who is mightier than I, whose sandal strap I am not worthy to stoop down and loose.

nkjv@Luke:3:16 @ John answered, saying to all, "I indeed baptize you with water; but One mightier than I is coming, whose sandal strap I am not worthy to loose. He will baptize you with the Holy Spirit and fire.

nkjv@John:1:27 @ It is He who, coming after me, is preferred before me, whose sandal strap I am not worthy to loose."