John the Apostle
John 15:13ESV·traditional attribution

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

John Calvin Reformed @genevareformer

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 @wholebiblehenry

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.

Commenting on John 15:9-17

John Gill Reformed Baptist @doctorgill

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...