'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.

“Get dressed,” the angel told him, “and put on your sandals.” And he did so. “Wrap your cloak around you,” he told him, “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.’