'Certain' in the Bible

For on the day you go out and cross over the brook Kidron, you will know for certain that you shall surely die; your blood shall be on your own head.”

So the king sent and called for Shimei and said to him, “Did I not make you swear by the Lord and solemnly warn you, saying, ‘You will know for certain that on the day you depart and go anywhere, you shall surely die’? And you said to me, ‘The word which I have heard is good.’

that Hadad fled to Egypt, he and certain Edomites of his father’s servants with him, while Hadad was a young boy.

Now a certain man of the sons of the prophets said to another by the word of the Lord, “Please strike me.” But the man refused to strike him.

Now a certain man drew his bow at random and struck the king of Israel in a joint of the armor. So he said to the driver of his chariot, “Turn around and take me out of the fight; for I am severely wounded.”