John the Apostle
John 13:35ESV·traditional attribution

By this all people will know that you are my disciples, if you have love for one another.”

John Calvin Reformed @genevareformer

35. By this all men will know. Christ again confirms what he had formerly said, that they who mutually love one another have not been in vain taught in his school; as if he had said, Not only will you know that you are my disciples, but your profession will also be acknowledged by others to be sincere.” Since Christ lays down this mark for...

Matthew Henry Presbyterian @wholebiblehenry

This and what follows, to the end of ch. 14, was Christ's table-talk with his disciples. When supper was done, Judas went out; but what did the Master and his disciples do, whom he left sitting at table? They applied themselves to profitable discourse, to teach us as much as we can to make conversation with our friends at table serviceable to religion. Christ begins this discourse.

Commenting on John 13:31-35

John Gill Reformed Baptist @doctorgill

By this shall all men know,.... Not only by this you yourselves will know that ye have passed from death to life, that the true work of grace is begun upon your hearts; nor only by this will you know one another to be Christians; but by this all men, even the men of the world will know, that ye are my disciples, if ye...