'Certain' in the Bible

For be certain that on the day when you go out and go over the stream Kidron, death will overtake you: and your blood will be on your head.

Then the king sent for Shimei, and said to him, Did I not make you take an oath by the Lord, protesting to you and saying, Be certain that on the day when you go out from here, wherever you go, death will overtake you? and you said to me, Very well!

Then I will make the seat of your rule over Israel certain for ever, as I gave my word to David your father, saying, You will never be without a man to be king in Israel.

Hadad, being still a young boy, went in flight to Egypt, with certain Edomites, servants of his father;

Then the woman said to Elijah, Now I am certain that you are a man of God, and that the word of the Lord in your mouth is true.

And a certain man of the sons of the prophets said to his neighbour by the word of the Lord, Give me a wound. But the man would not.

And a certain man sent an arrow from his bow without thought of its direction, and gave the king of Israel a wound where his breastplate was joined to his clothing; so he said to the driver of his war-carriage, Go to one side and take me away out of the army, for I am badly wounded.