'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 [worthy of reverence and respect].

The angel said to him, “Prepare yourself and strap on your sandals [to get ready for whatever may happen].” And he did so. Then the angel told him, “Put on your robe and follow me.”

And as John was finishing his course [of ministry], he kept saying, ‘What or who do you think that I am? I am not He [the Christ]; but be aware, One is coming after me whose sandals I am not worthy to untie [even as His slave]!’