Hebrews 13:1 - Albert Barnes' Notes on the Bible

Let brotherly love continue - Implying that it now existed among them. The apostle had no occasion to reprove them for the want of it, as he had in regard to some to whom he wrote, but he aims merely to impress on them the importance of this virtue, and to caution them against the danger of allowing it ever to be interrupted; see the notes on John 13:34.