'Certainly' in the Bible

Elijah said to Elisha, "Please stay here, for Yahweh has sent me up to Bethel." Elisha said, "{As Yahweh lives} and {as your soul lives}, I will certainly not leave you!" So they went down [to] Bethel.

Elijah said to him, "Elisha, please stay here because Yahweh has sent me to Jericho." And he said, "{As Yahweh lives} and {as your soul lives}, I will certainly not leave you!" So they came to Jericho.

Then Elijah said to him, "Please stay here, because Yahweh has sent me to the Jordan." He said, "{As Yahweh lives} and {as your soul lives}, I will certainly not leave you!" So the two of them went on.

Then they said, "This [is] blood! Certainly the kings have fought one another, and each has killed his neighbor. Now, to the war booty, O Moab!"

But Gehazi the servant of Elisha, the man of God, thought, "Look, my master has refrained from taking what this Aramean Naaman brought from his hand. {As Yahweh lives}, I will certainly run after him, and I will accept something from him."

Elisha said to him, "Go; say to him, 'You shall certainly recover,' but Yahweh has shown me that he certainly will die."

So he departed from Elisha and came to his master. He asked him, "What did Elisha say to you." So he said, "He said to me that you will certainly recover."

Do not let Hezekiah [make you] trust in Yahweh, saying, "Certainly Yahweh will rescue us, and this city shall not be given into the hand of the king of Assyria!" '