'Deceitfully' in the Bible

Moses said, "Behold, I go out from you, and I will pray to Yahweh that the swarms of flies may depart from Pharaoh, from his servants, and from his people, tomorrow; only don't let Pharaoh deal deceitfully any more in not letting the people go to sacrifice to Yahweh."

If she doesn't please her master, who has married her to himself, then he shall let her be redeemed. He shall have no right to sell her to a foreign people, since he has dealt deceitfully with her.