Continuing on from his revelation of himself as the true vine of Israel in v1-11 of John 15, Jesus then calls his disciples to abide in him by loving one another. He makes it clear that we as his disciples are to abide it him if we are his friends and also reminds us that he has made us his friends by choosing and appointing us to bear fruit.
This is my commandment, that you love one another as I have loved you.13 Greater love has no one than this, that someone lay down his life for his friends.14 You are my friends if you do what I command you. 15 No longer do I call you servants,[a] for the servant does not know what his master is doing; but I have called you friends, for all that I have heard from my Father I have made known to you. 16 You did not choose me, but I chose you and appointed you that you should go and bear fruit and that your fruit should abide, so that whatever you ask the Father in my name, he may give it to you. 17 These things I command you, so that you will love one another.