'Commandment' in the Bible

But this I say by way of concession, not of commandment.

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

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.