'Wool' in the Bible

Come now, and let us have an argument together, says the Lord: how may your sins which are red like blood be white as snow? how may their dark purple seem like wool?

For like a coat they will be food for the insect, the worm will make a meal of them like wool: but my righteousness will be for ever, and my salvation to all generations.

Men were cruel to him, but he was gentle and quiet; as a lamb taken to its death, and as a sheep before those who take her wool makes no sound, so he said not a word.