'Sandals' in the Bible

“Then the Lord said to him:Remove the sandals from your feet, for the place where you are standing is holy ground.

And the angel said unto him, Gird thyself, and bind on thy sandals. And so he did. And he saith unto him, Cast thy garment about thee, and follow me.

Then as John was completing his life’s work, he said, ‘Who do you think I am? I am not the One. But look! Someone is coming after me, and I am not worthy to untie the sandals on His feet.’