John 13:34-35
34 A new commandment I give to you, that you love one another; as I have loved you, that you also love one another. 35 By this all will know that you are My disciples, if you have love for one another.
1 John2
Brethren, I write no new commandment to you, but an old commandment which you have had from the beginning. The old commandment is the word which you heard from the beginning. 8 Again, a new commandment I write to you, which thing is true in Him and in you, because the darkness is passing away, and the true light is already shining.
9 He who says he is in the light, and hates his brother, is in darkness until now. 10 He who loves his brother abides in the light, and there is no cause for stumbling in him. 11 But he who hates his brother is in darkness and walks in darkness, and does not know where he is going, because the darkness has blinded his eyes.
Sorry it was only John, but what James says looks like it:
James 1:27
Pure and undefiled religion before God and the Father is this: to visit orphans and widows in their trouble, and to keep oneself unspotted from the world.
Matthew 22:37
Jesus said to him, You shall love the Lord your God with all your heart, with all your soul, and with all your mind. 38 This is the first and great commandment. 39 And the second is like it: You shall love your neighbor as yourself. 40 On these two commandments hang all the Law and the Prophets.