'Certain Man' in the Bible

Now there was a certain man of Ramathaim, a Zuphite of the hill-country of Ephraim, named Elkanah; he was the son of Jeroham, the son of Elihu, the son of Tohu, the son of Zuph, an Ephraimite:

Now a certain man of the servants of Saul was there that day, kept back before the Lord; his name was Doeg, an Edomite, the strongest of Saul's runners.