'Untie' in the Bible

saying to them, “Go into the village opposite you, and at once you will find a donkey tied, and a colt with her; untie them and bring them to 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]!’