'Commandment of the Lord' in the Bible

Now concerning virgins I have no commandment of the Lord: yet I give my judgment, as one that hath obtained mercy of the Lord to be faithful.

If any man thinketh himself to be a prophet, or spiritual, let him take knowledge of the things which I write unto you, that they are the commandment of the Lord.

to be mindful of the words spoken before by the holy prophets, and of the commandment of the Lord and Saviour by your apostles;