'Certain' in the Bible

For on the day you go out, and pass over the brook Kidron, know for certain that you shall surely die: your blood shall be on your own head."

The king sent and called for Shimei, and said to him, "Didn't I adjure you by Yahweh, and warn you, saying, 'Know for certain, that on the day you go out, and walk abroad any where, you shall surely die?' You said to me, 'The saying that I have heard is good.'

that Hadad fled, he and certain Edomites of his father's servants with him, to go into Egypt, Hadad being yet a little child.

A certain man of the sons of the prophets said to his fellow by the word of Yahweh, "Please strike me!" The man refused to strike him.

A certain man drew his bow at random, and struck the king of Israel between the joints of the armor. Therefore he said to the driver of his chariot, "Turn your hand, and carry me out of the battle; for I am severely wounded."