John 15:13 (BSB)

Greater love has no one than this, that he lay down his life for his friends.

From John 15. Also in the ESV.

Commentary on John 15:13

• John Calvin (Reformed), Calvin's Commentaries on John 15:13: 13. Greater love hath no one than this. Christ sometimes proclaims the greatness of his love to us, that he may more fully confirm our confidence in our salvation; but now he proceeds further, in order to inflame us, by his example, to love the brethren.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on John 15:9-17: Christ, who is love itself, is here discoursing concerning love, a fourfold love. I. Concerning the Father's love to him; and concerning this he here tells us, 1. That the Father did love him (Joh 15:9): As the Father hath loved me. He loved him as Mediator: This is my beloved Son. He was the Son of his love.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on John 15:13: Ye are my friends,.... This is an application of the foregoing passage, and more, clearly explains it. The character of "friends", is applied to the disciples of Christ; and belongs, not only to his apostles, but to all that love him, believe in him, and obey him; to whom he has showed himself friendly, by laying down his life for them: for this clearly shows...
• Albert Barnes (Presbyterian), Barnes' New Testament Notes on John 15:13: Verse 13. Greater love hath, &c. No higher expression of love could be given. Life is the most valuable object we possess; and when a man is willing to lay that down for his friends or his country, it shows the utmost extent of love. Even this love for friends has been rarely witnessed.