'Certain' in the Bible

It shall happen that on the day you go out and cross over the Wadi Kidron, know for certain that {you will surely die}. Your blood will be on your head."

the king sent and summoned Shimei, and he said to him, "Did I not make you swear by Yahweh? I warned you, saying, 'On the day you go out and you go {anywhere whatsoever}, know for certain that {you will surely die}.' And you said to me, 'The word is good; I accept.'

Now a certain older prophet was living in Bethel, and his son came and recounted to him all of the things that the man of God had done that day in Bethel [and] the words he had spoken to the king, and they told them to their father.

Then he went into the wilderness one day's journey, and he went and sat under a certain broom tree. Then {he asked Yahweh that he might die}, and he said, "It is enough now, Yahweh; take my life, for I am no better than my ancestors."

He lay down and fell asleep under a certain broom tree, and suddenly this angel [was] touching him and said to him, "Get up, eat!"

Suddenly a certain prophet approached Ahab king of Israel and said, "Thus says Yahweh: 'Have you seen all this great crowd? Behold, I [am] giving it into your hand today, that you may know that I [am] Yahweh.'"

A certain man from the sons of the prophets said to his fellow countryman, "By the word of Yahweh, please strike me." But the man refused to strike him.

The king of Israel summoned a certain court official, and he said, "Quickly fetch Micaiah son of Imlah."