'Certainly' in the Bible

Samuel said, “Bring me Agag king of Amalek.”Agag came to him trembling, for he thought, “Certainly the bitterness of death has come.”

When they arrived, Samuel saw Eliab and said, “Certainly the Lord’s anointed one is here before Him.”

But David said, “Your father certainly knows that you have come to look favorably on me. He has said, ‘Jonathan must not know of this, or else he will be grieved.’” David also swore, “As surely as the Lord lives and as you yourself live, there is but a step between me and death.”

David added, “As the Lord lives, the Lord will certainly strike him down: either his day will come and he will die, or he will go into battle and perish.

Saul said to him, “You are blessed, my son David. You will certainly do great things and will also prevail.” Then David went on his way, and Saul returned home.

and David asked the Lord: “Should I pursue these raiders? Will I overtake them?”The Lord replied to him, “Pursue them, for you will certainly overtake them and rescue the people.”