'Slander' in the Bible

Enough for the learner to be on a level with his teacher, and for the servant to be on a level with his master. If they have called the master of the house Baal-zebul, how much more will they slander his servants?

I would therefore have the younger women marry, bear children, rule in domestic matters, and furnish the Adversary with no excuse for slander.

Yet argue modestly and cautiously, keeping your consciences free from guilt, so that, when you are spoken against, those who slander your good Christian lives may be put to shame.