The Apostle Paul
1 Thessalonians 4:9ASV·traditional attribution

But concerning love of the brethren ye have no need that one write unto you: for ye yourselves are taught of God to love one another;

Geneva Bible Notes Reformed

But as touching brotherly love ye need not that I write unto you: for ye yourselves are taught of God to love one another. (6) Thirdly, he requires a ready mind to every manner of lovingkindness, and exhorts them to profit more and more in that virtue.

Jamieson-Fausset-Brown Reformed

brotherly love, &c.--referring here to acts of brotherly kindness in relieving distressed brethren. Some oldest manuscripts support English Version reading, "YE have"; others, and those the weightiest, read, "WE have." We need not write, as ye yourselves are taught, and that by God: namely, in the heart by the Holy Spirit (Joh 6:45; Heb 8:11; Jo1 2:20, Jo1 2:27).

John Gill Reformed Baptist

But as touching brotherly love,.... Another branch of sanctification; which is distinct from love to God and Christ, though it always accompanies it, and from love to all mankind; and is what is peculiar to brethren in a spiritual relation, and ought to be universal, fervent, and sincere, and as Christ has loved them: concerning which the following things are said, ye need not that I write unto you.