The Apostle Paul
Romans 12:10BSB·traditional attribution

Be devoted to one another in brotherly love. Outdo yourselves in honoring one another.

Albert Barnes Presbyterian

Verse 10. Be kindly affectioned. The word here used occurs nowhere else in the New Testament. It properly denotes tender affection, such as that which subsists between parents and children; and it means, that Christians should have similar feelings towards each other, as belonging to the same family, and as united in the same principles and interests. The Syriac renders this, "Love your brethren, and love one another." Comp. .

John Calvin Reformed

10. With brotherly love, etc. By no words could he satisfy himself in setting forth the ardor of that love, with which we ought to embrace one another: for he calls it brotherly, and its emotion στοργὴν, affection, which, among the Latins, is the mutual affection which exists between relatives; and truly such ought to be that which we should have towards the children of God.

Jamieson-Fausset-Brown Reformed

Be, &c.--better, "In brotherly love be affectionate one to another; in [giving, or showing] honor, outdoing each other." The word rendered "prefer" means rather "to go before," "take the lead," that is, "show an example." How opposite is this to the reigning morality of the heathen world!