Love and do good to one another

“A new commandment I give to you, that you love one another: just as I have loved you, you also are to love one another. By this all people will know that you are my disciples, if you have love for one another.” (John 13:34-35 ESV)

Look to the interest of others

“Let each of you look not only to his own interests, but also to the interests of others.” (Phil. 2:4 ESV)

Doing works toward others is living faith

“What good is it, my brothers, if someone says he has faith but does not have works? Can that faith save him? If a brother or sister is poorly clothed and lacking in daily food, and one of you says to them, “Go in peace, be warmed and filled,” without giving them the things needed for the body, what good is that? So also faith by itself, if it does not have works, is dead.” (James 2:14-17 ESV)

Especially do good to other believers

“So then, as we have opportunity, let us do good to everyone, and especially to those who are of the household of faith.” (Gal. 6:10 ESV)