'Command' in the Bible

My dearly-loved friends, it is no new command that I am now giving you, but an old command which you have had from the very beginning. By the old command I mean the teaching which you have already received.

And yet I *am* giving you a new command, for such it really is, so far as both He and you are concerned: because the darkness is now passing away and the light, the true light, is already beginning to shine.

And this is His command--that we are to believe in His Son Jesus Christ and love one another, just as He has commanded us to do.

And the command which we have from Him is that he who loves God must love his brother man also.