'Certainty' in the Bible

know with certainty that the Lord your God will not continue to drive these nations out from before you; but they will be a snare and a trap to you, and a whip on your sides and thorns in your eyes, until you perish from off this good land which the Lord your God has given you.

So look, and learn about all the hiding places where he hides himself and return to me with certainty, and I will go with you; and if he is in the land, I will search him out among all the thousands of Judah.”

To make you know the certainty of the words of truthThat you may correctly answer him who sent you?

For this you know with certainty, that no immoral or impure person or covetous man, who is an idolater, has an inheritance in the kingdom of Christ and God.