'Certain' in the Bible

There was a certain Jew in the citadel of Susa whose name was Mordecai the son of Jair, the son of Shimei, the son of Kish, a Benjamite,

Then Haman said to King Ahasuerus, “There is a certain people scattered [abroad] and dispersed among the peoples in all the provinces of your kingdom; their laws are different from those of all other people, and they do not observe the king’s laws. Therefore it is not in the king’s interest to [tolerate them and] let them stay here.