Romans 5:8 (BSB)

But God proves His love for us in this: While we were still sinners, Christ died for us.

From Romans 5. Also in the ESV.

Commentary on Romans 5:8

• John Calvin (Reformed), Calvin's Commentaries on Romans 5:8: 8. But God confirms, etc. The verb, συνίστησι, has various meanings; that which is most suitable to this place is that of confirming; for it was not the Apostle’s object to excite our gratitude, but to strengthen the trust and confidence of our souls.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Romans 5:6-21: The apostle here describes the fountain and foundation of justification, laid in the death of the Lord Jesus. The streams are very sweet, but, if you run them up to the spring-head, you will find it to be Christ's dying for us; it is in the precious stream of Christ's blood that all these privileges come flowing to us: and therefore he enlarges upon this...
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Romans 5:8: But God commendeth his love towards us,.... That is, he hath manifested it, which was before hid in his heart; he has given clear evidence of it, a full proof and demonstration of it; he has so confirmed it by this instance, that there is no room nor reason to doubt of it; he has illustrated and set it off with the greater lustre by...
• Albert Barnes (Presbyterian), Barnes' New Testament Notes on Romans 5:8: Verse 8. But God commendeth, etc. God has exhibited or showed his love in this unusual and remarkable manner. His love. His kind feeling; his beneficence; his willingness to submit to sacrifice to do good to others. While we were yet sinners. And of course his enemies. In this, his love surpasses all that has ever been manifested among men. Christ died for us.