'Certainly' in the Bible

On the day you do leave and cross the Kidron Valley, know for sure that you will certainly die. Your blood will be on your own head.”

So the king summoned Shimei and said to him, “Didn’t I make you swear by the Lord and warn you, saying, ‘On the day you leave and go anywhere else, know for sure that you will certainly die’? And you said to me, ‘The sentence is fair; I will obey.’

Now the king of Aram’s servants said to him, “Their gods are gods of the hill country. That’s why they were stronger than we were. Instead, we should fight with them on the plain; then we will certainly be stronger than they will be.

Raise another army for yourself like the army you lost—horse for horse, chariot for chariot—and let’s fight with them on the plain; and we will certainly be stronger than they will be.” The king listened to them and did so.

“The Lord asked him, ‘How?’“He said, ‘I will go and become a lying spirit in the mouth of all his prophets.’“Then He said, ‘You will certainly entice him and prevail. Go and do that.’