'Certain' in the Bible

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

And a certain man was there who had [been] thirty-eight years in his sickness.

Now a certain man was sick, Lazarus from Bethany, the village of Mary and her sister Martha.

But a certain one of them, Caiaphas (who was high priest in that year), said to them, "You do not know anything at all!