'Assured' in the Bible

Saul said to his uncle, "He assured us that the donkeys had been found." But Saul did not tell him what Samuel had said about the matter of kingship.

If he should then say, 'That's fine,' then your servant is safe. But if he becomes very angry, be assured that he has decided to harm me.

Then David took from her hand what she had brought to him. He said to her, "Go back to your home in peace. Be assured that I have listened to you and responded favorably."