What does the Bible say about love among believers?

Love among believers is a hallmark of the Christian faith, as evident in Colossians 1:4 where Paul's mention of their love for all the saints accompanies their faith. This love is not a mere emotion but a deep, self-sacrificial commitment to one another, reflecting the love of Christ. According to John 13:34-35, Jesus commands His followers to love one another just as He loved them, stating that this love is the distinguishing mark of discipleship. As the Holy Spirit transforms believers, this love for both Christ and others flows from a heart that has been changed, signifying the genuine work of God in their lives.