'Certain Man' in the Bible

And a certain man of the sons of the prophets said by the word of LORD to his fellow, Smite me, I pray thee. And the man refused to smite him.

And a certain man drew his bow at a venture, and smote the king of Israel between the joints of the armor. Therefore he said to the driver of his chariot, Turn thy hand, and carry me out of the army, for I am severely wounded.