The New Commandment in the context of "Maestà (Duccio)"

In the New Testament, chapters 14–17 of the Gospel of John are known as the Farewell Discourse given by Jesus to eleven of his disciples immediately after the conclusion of the Last Supper in Jerusalem, the night before his crucifixion.

The discourse is generally seen as having distinct components. First, Jesus tells the disciples that he will be going away to the Father, and that he will send the Holy Spirit to guide the disciples. Jesus bestows peace on the disciples and commands them to love one another. The expression of the unity of love between Jesus and his Father, in the Spirit, as it applies to his disciples in the love of Christ, is a key theme in the discourse, manifested by several reiterations of the New Commandment: "love one another as I have loved you".

The love of Christ is a central element of Christian belief and theology. It refers to the love of Jesus Christ for humanity, the love of Christians for Christ, and the love of Christians for others. These aspects are distinct in Christian teachings—the love for Christ is a reflection of his love for all people.

The theme of love is the key element of Johannine writings. This is evidenced in one of the most widely quoted scriptures in the Bible: (John 3:16) ”For God so loved the world, that he gave His only begotten Son, that whosoever believeth on Him should not perish, but have eternal life.” In the Gospel of John, the pericope of the Good Shepherd (John 10:1-21) symbolizes the sacrifice of Jesus based on His love for people. In that gospel, love for Christ results in the following of His commandments, the Farewell Discourse (14:23) stating: "If a man loves me, he will keep my word". In the First Epistle of John (4:19), the reflexive nature of this love is highlighted: "We love, because he first loved us", expressing the love of Christ as a mirroring of Christ's own love. Towards the end of the Last Supper, Jesus gives his disciples a new commandment: "Love one another, as I have loved you ... By this shall all men know that you are my disciples."

John 13 is the thirteenth chapter of the Gospel of John in the New Testament of the Christian Bible. The "latter half", "second book", or "closing part" of John's Gospel commences with this chapter. The nineteenth-century biblical commentator Alexander Maclaren calls it "the Holy of Holies of the New Testament" and the "most sacred part of the New Testament", as it begins John's record of the events on the last night before the crucifixion of Jesus Christ, emphasising Jesus' love for his disciples, demonstrated in the service of washing their feet, and his commandment that they love one another in the same way. The author of the book containing this chapter is anonymous, but early Christian tradition uniformly affirmed that John composed this Gospel.