'Surely' in the Bible

Then Samuel said, "Bring Agag the king of Amalek out to me!" Agag came to him confidently, for Agag thought, "Surely the bitterness of death {is over}."

{When they came}, he saw Eliab and said, "Surely his anointed one [is] before Yahweh!"

Then David {took an oath} again and said, "Your father knows very well that I have found favor in your eyes, and he thought, 'Do not let Jonathan know this, lest he worry.' But {as Yahweh lives} and {as your soul lives}, surely [there is] merely a step between me and death!"

But Saul said nothing on that day, for he thought, "{Something happened to him}. He [is] not [ceremonially] clean; surely he [is] not clean."

For {as long as} the son of Jesse [is] alive on the earth, you and your kingdom will not be established! So then, send and bring him to me, for {he will surely die}!"

Now David had said, "Surely {in vain} I guarded all that this fellow had in the desert. And nothing was missed of all that [was] his, but he returned evil against me in place of good!

But {as Yahweh lives}, the God of Israel who has prevented me from harming you, if you had not hurried and come to meet me, surely there would not have been {one male} left alive for Nabal by the light of morning!"

This thing that you have done [is] not good. {As Yahweh lives}, {surely you people deserve to die} since you have not kept watch over your lord, over Yahweh's anointed one! So then, see where the king's spear [is] and the jar of water that [was] near his head!"