What does the Bible say about the commandment of love?

In 1 John 3:18, the apostle John emphasizes that we should not only love in word or tongue but in deed and in truth. This commandment of love signifies the unique bond that exists between the children of God, which is not a natural affection but a supernatural love given by the Holy Spirit. This love is anchored in the truth of the gospel, which reveals that God saves sinners by His grace alone. Therefore, true love among believers manifests itself in actions that reflect the sacrificial love of Christ towards His own.