'Be Holy' in the Bible

To: God's church in Corinth, to those who have been sanctified by the Messiah Jesus and called to be holy, together with all those everywhere who call on the name of our Lord Jesus, the Messiah their Lord and ours.

There is difference also between a wife and a virgin. The unmarried woman careth for the things of the Lord, that she may be holy both in body and in spirit: but she that is married careth for the things of the world, how she may please her husband.

An unmarried woman or virgin is concerned about the affairs of the Lord, so that she may be holy in body and spirit. But a married woman is concerned about the affairs of this world, that is, about how she can please her husband. I'm saying this for your benefit, not to put a noose around your necks, but to promote good order and unhindered devotion to the Lord.