'Command' in the Bible

I say the following as a concession, not as a command.

And unto the married I command, yet not I, but the Lord, Let not the wife depart from her husband:

However, each one must live his life in the situation the Lord assigned when God called him. This is what I command in all the churches.

This is what I command in all the Churches. Was any one already circumcised when called? Let him not have recourse to the surgeons. Was any one uncircumcised when called? Let him remain uncircumcised.

About virgins: I have no command from the Lord, but I do give an opinion as one who by the Lord’s mercy is trustworthy.

But in giving you this command, I don't praise you, that you come together not for the better but for the worse.

If anyone thinks he is a prophet or spiritual, he should recognize that what I write to you is the Lord’s command.

If anyone does not recognize this [that it is a command of the Lord], he is not recognized [by God].