'Unmarried' in the Bible

Now I say to the unmarried and to the widows: [It is] good for them if they remain as I [am].

But if indeed she does separate, she must remain unmarried or be reconciled to her husband. And a husband must not divorce [his] wife.

But I want you to be free from care. The unmarried person cares for the things of the Lord, how he may please the Lord.

and he is divided. And the unmarried woman or the virgin cares for the things of the Lord, in order that she may be holy both in body and in spirit. But the married woman cares for the things of the world, how she may please her husband.