'Certainly' in the Bible

Now therefore thus saith Jehovah: Thou shalt not come down from the bed on which thou art gone up, but shalt certainly die. And Elijah departed.

And they said unto him, A man came up to meet us, and said to us, Go, return to the king that sent you and say to him, Thus saith Jehovah: Is it because there is not a God in Israel, that thou sendest to inquire of Baal-zebub the god of Ekron? therefore thou shalt not come down from the bed on which thou art gone up, but shalt certainly die.

And he said to him, Thus saith Jehovah: Forasmuch as thou hast sent messengers to inquire of Baal-zebub the god of Ekron, is it because there is no God in Israel to inquire of his word? therefore thou shalt not come down from the bed on which thou art gone up, but shalt certainly die.

And Naaman was wroth, and went away and said, Behold, I thought, He will certainly come out to me, and stand, and call on the name of Jehovah his God, and wave his hand over the place, and cure the leper.

And Elisha said to him, Go, say to him, Thou wilt certainly recover. But Jehovah has shewn me that he shall certainly die.

And he departed from Elisha, and came to his master, who said to him, What did Elisha say to thee? And he said, He told me that thou wouldest certainly recover.

Certainly I have seen yesterday the blood of Naboth, and the blood of his sons, saith Jehovah; and I will requite thee in this plot, saith Jehovah. And now, take and cast him into the plot, according to the word of Jehovah.

Neither let Hezekiah make you rely upon Jehovah, saying, Jehovah will certainly deliver us, and this city shall not be given into the hand of the king of Assyria.