'Master' in the Bible

It is enough for the disciple that he be as his teacher, and the servant as his lord. If they have called the master of the house Beelzebub, how much more them of his household!

Neither be ye called masters: for one is your master, even the Christ.

But know this, that if the master of the house had known in what watch the thief was coming, he would have watched, and would not have suffered his house to be broken through.