'Certain' in the Bible

Behold, six men came from the direction of the upper gate which faces north, each with his shattering weapon in his hand; and among them was a certain man clothed in linen with a writing case at his loins. And they went in and stood beside the bronze altar.

Now in the seventh year, in the fifth month, on the tenth of the month, certain of the elders of Israel came to inquire of the Lord, and sat before me.