'Untie' in the Bible

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

Then the Lord answered him, "You hypocrites! Does not each of you on the Sabbath untie his ox or his donkey from its stall, and lead it to water?

telling them, "Go to the village ahead of you. When you enter it, you will find a colt tied there that has never been ridden. Untie it and bring it here.