'Certain' in the Bible

Now a certain man, a Pharisee named Nicodemus, who was a member of the Jewish ruling council,

Now a dispute came about between some of John's disciples and a certain Jew concerning ceremonial washing.

Now he came again to Cana in Galilee where he had made the water wine. In Capernaum there was a certain royal official whose son was sick.

Now a certain man named Lazarus was sick. He was from Bethany, the village where Mary and her sister Martha lived.