'Untie' in the Bible

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

But the Lord answered him and said, “Hypocrites! Doesn’t each one of you untie his ox or donkey from the feeding trough on the Sabbath and lead it to water?

and said, “Go into the village ahead of you. As you enter it, you will find a young donkey tied there, on which no one has ever sat. Untie it and bring it here.