'Strap' in the Bible

He was preaching: “Someone more powerful than I will come after me. I am not worthy to stoop down and untie the strap of His sandals.

John answered them all, “I baptize you with water, but One is coming who is more powerful than I. I am not worthy to untie the strap of His sandals. He will baptize you with the Holy Spirit and fire.

He is the One coming after me, whose sandal strap I’m not worthy to untie.”