'Sandal strap' in the Bible

that I will not take a thread nor a sandal strap nor anything that is yours, lest you should say, 'I have made Abram rich.'

None of them grows weary or stumbles;no one slumbers or sleeps.No belt is looseand no sandal strap broken.

His announcement was, "There is One coming after me mightier than I--One whose sandal-strap I am unworthy to stoop down and unfasten.

he answered the question by saying to them all, "As for me, I am baptizing you with water, but One mightier than I is coming, whose very sandal-strap I am not worthy to unfasten: He will baptize you in the Holy Spirit and with fire.

He who is to come after me, and whose sandal-strap I am not worthy to unfasten."