'Certainty' in the Bible

And Jonathan said, Far be it from thee; for, if I knew with certainty that evil were determined by my father to come upon thee, would I not tell it thee?

See therefore, and take knowledge of all the lurking places where he hideth himself, and come ye again to me with the certainty, and I will go with you: and it shall come to pass, if he be in the land, that I will search him out throughout all the thousands of Judah.

David therefore sent out spies, and understood that Saul was come of a certainty.