'Certain' in the Bible

And a certain woman threw an upper millstone upon Abim'elech's head, and crushed his skull.

And there was a certain man of Zorah, of the tribe of the Danites, whose name was Mano'ah; and his wife was barren and had no children.

In those days, when there was no king in Israel, a certain Levite was sojourning in the remote parts of the hill country of E'phraim, who took to himself a concubine from Bethlehem in Judah.