'Dirty' in the Bible

"Because you're playing a dirty trick on me," Balaam answered the donkey. "If only I had a sword in my hand! I'd kill you right now!"

The next day, a man escaped from Saul's camp! With torn clothes and dirty hair, he approached David, fell to the ground, and bowed down to him.

"I've taken off my clothes am I supposed to put them on again? I've washed my feet am I supposed to get them dirty again?"