'Injunction' in the Bible

This is His commandment, that we believe [with personal faith and confident trust] in the name of His Son Jesus Christ, and [that we unselfishly] love and seek the best for one another, just as He commanded us.

And this commandment we have from Him, that the one who loves God should also [unselfishly] love his brother and seek the best for him.

Now I ask you, lady, not as if I were writing to you a new commandment, but [simply reminding you of] the one which we have had from the beginning, that we love and unselfishly seek the best for one another.