'Certain' in the Bible

And it shall be that on the day thou goest forth, and passest over the torrent of Kidron, ... know for certain that thou shalt surely die: thy blood shall be upon thine own head.

And the king sent and called for Shimei, and said to him, Did I not make thee swear by Jehovah, and protest to thee, saying, Know for certain, that on the day thou goest forth, and walkest abroad anywhere, thou shalt surely die? and thou saidst to me, The word 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.

Now there dwelt a certain old prophet in Bethel; and his sons came and told him all the works that the man of God had done that day in Bethel; the words that he had spoken to the king, them they told also to their father.

And he himself went a day's journey into the wilderness, and came and sat down under a certain broom-bush, and requested for himself that he might die; and said, It is enough: now, Jehovah, take my life; for I am not better than my fathers.

And a certain man of the sons of the prophets said to another by the word of Jehovah, Smite me, I pray thee. But the man refused to smite him.