'Certainly' in the Bible

Therefore, this is what the Lord says: ‘You will not get up from your sickbed—you will certainly die.’” Then Elijah left.

They replied, “A man came to meet us and said, ‘Go back to the king who sent you and declare to him: This is what the Lord says: Is it because there is no God in Israel that you’re sending these men to inquire of Baal-zebub, the god of Ekron? Therefore, you will not get up from your sickbed—you will certainly die.’”

Then Elijah said to King Ahaziah, “This is what the Lord says: ‘Because you have sent messengers to inquire of Baal-zebub, the god of Ekron—is it because there is no God in Israel for you to inquire of His will?—you will not get up from your sickbed; you will certainly die.’”

Don’t let Hezekiah persuade you to trust in the Lord by saying: Certainly the Lord will deliver us! This city will not be handed over to the king of Assyria.’

‘The time will certainly come when everything in your palace and all that your fathers have stored up until this day will be carried off to Babylon; nothing will be left,’ says the Lord.