1 John 4:7 (BSB)

Beloved, let us love one another, because love comes from God. Everyone who loves has been born of God and knows God.

From 1 John 4. Also in the ESV.

Commentary on 1 John 4:7

• John Calvin (Reformed), Calvin's Commentaries on 1 John 4:7: 7 Beloved He returns to that exhortation which he enforces almost throughout the Epistle. We have, indeed, said, that it is filled with the doctrine of faith and exhortation to love. On these two points he so dwells, that he continually passes from the one to the other.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on 1 John 4:7-13: As the Spirit of truth is known by doctrine (thus spirits are to be tried), it is known by love likewise; and so here follows a strong fervent exhortation to holy Christian love: Beloved, let us love one another, Jo1 4:7.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on 1 John 4:7: Beloved, let its love one another,.... The apostle having finished what he proposed to say concerning the trying of spirits, returns to his former exhortation to brotherly love, and which comes with fresh force and strength; for since worldly men follow, hear, embrace, and cleave to the false teachers; such as are of God, and on the side of truth, should love one another, and...
• Albert Barnes (Presbyterian), Barnes' New Testament Notes on 1 John 4:7: Verse 7. Beloved, let us love one another. This verse introduces a new topic, the consideration of which occupies the remainder of the chapter. See the Analysis. The subject is one on which John dwells more than on any other--that of love.