'Certain Man' in the Bible

And John answered him, saying, Teacher, we saw a certain man, who does not follow us, casting out demons in thy name, and we forbade him, because he does not follow us.

And he began to speak to them by parables. A certain man planted a vineyard, and set a hedge about it, and digged a place for the wine-vat, and built a tower, and let it out to husbandmen, and went into a far country.

And they forced a certain man who was passing by, Simon of Cyrene (the father of Alexander and Rufus), who was coming from the country, to carry his cross.