1 John 3:10-18New International Version - UK (NIVUK)
10 This is how we know who the children of God are and who the children of the devil are: anyone who does not do what is right is not God’s child, nor is anyone who does not love their brother and sister.
More on love and hatred
11 For this is the message you heard from the beginning: we should love one another. 12 Do not be like Cain, who belonged to the evil one and murdered his brother. And why did he murder him? Because his own actions were evil and his brother’s were righteous. 13 Do not be surprised, my brothers and sisters,[a] if the world hates you. 14 We know that we have passed from death to life, because we love each other. Anyone who does not love remains in death. 15 Anyone who hates a brother or sister is a murderer, and you know that no murderer has eternal life residing in him.
16 This is how we know what love is: Jesus Christ laid down his life for us. And we ought to lay down our lives for our brothers and sisters. 17 If anyone has material possessions and sees a brother or sister in need but has no pity on them, how can the love of God be in that person? 18 Dear children, let us not love with words or speech but with actions and in truth.
1 John 4:7-5:1New International Version - UK (NIVUK)
God’s love and ours
7 Dear friends, let us love one another, for love comes from God. Everyone who loves has been born of God and knows God. 8 Whoever does not love does not know God, because God is love. 9 This is how God showed his love among us: he sent his one and only Son into the world that we might live through him. 10 This is love: not that we loved God, but that he loved us and sent his Son as an atoning sacrifice for our sins. 11 Dear friends, since God so loved us, we also ought to love one another. 12 No one has ever seen God; but if we love one another, God lives in us and his love is made complete in us.
13 This is how we know that we live in him and he in us: he has given us of his Spirit. 14 And we have seen and testify that the Father has sent his Son to be the Saviour of the world. 15 If anyone acknowledges that Jesus is the Son of God, God lives in them and they in God. 16 And so we know and rely on the love God has for us.
God is love. Whoever lives in love lives in God, and God in them. 17 This is how love is made complete among us so that we will have confidence on the day of judgment: in this world we are like Jesus. 18 There is no fear in love. But perfect love drives out fear, because fear has to do with punishment. The one who fears is not made perfect in love.
19 We love because he first loved us. 20 Whoever claims to love God yet hates a brother or sister is a liar. For whoever does not love their brother and sister, whom they have seen, cannot love God, whom they have not seen. 21 And he has given us this command: anyone who loves God must also love their brother and sister.
Faith in the incarnate Son of God
5 Everyone who believes that Jesus is the Christ is born of God, and everyone who loves the father loves his child as well.