13:8 except to love one another Represents the second greatest commandment (see Lev 19:18; Matt 22:39; Luke 10:27).
Love is the greatest of the Christian virtues and the distinguishing mark of Christ’s disciples (John 13:35). Both Jesus and Paul identified self-sacrificial death as the primary demonstration of divine love (John 15:13; see note on Rom 5:8). Those who exhibit this love do not seek to harm another (v. 10); rather, they work for the benefit of another regardless of merit. In this sense, love fulfills the requirements of the law.
has fulfilled the law Paul suggests that love of neighbor is the essence of the law (compare Gal 5:14; 6:2).
Barry, J. D., Mangum, D., Brown, D. R., Heiser, M. S., Custis, M., Ritzema, E., … Bomar, D. (2012, 2016).
Faithlife Study Bible (Ro 13:8). Bellingham, WA: Lexham Press.