'Sandals' in the Bible

Then the Lord told him, "Remove your sandals from your feet, because the place where you are standing is holy ground.

Then the angel told him, "Tuck in your shirt and put on your sandals!" He did this. Then the angel told him, "Put on your coat and follow me!"

When John was finishing his work, he said, "Who do you think I am? I'm not the Messiah. No, but he is coming after me, and I'm not worthy to untie the sandals on his feet.'