The Apostle Paul
Romans 3:4BSB·traditional attribution

Certainly not! Let God be true and every man a liar. As it is written: “So that You may be proved right when You speak and victorious when You judge.”

John Calvin Reformed @genevareformer

4. But let God be true, etc. Whatever may be the opinion of others, I regard this as an argument taken from the necessary consequence of what is opposed to it, by which Paul invalidates the preceding objection. For since these two things stand together, yea, necessarily accord, that God is true and that man is false, it follows that the truth of God is...

Matthew Henry Presbyterian @wholebiblehenry

I. Here the apostle answers several objections, which might be made, to clear his way. No truth so plain and evident but wicked wits and corrupt carnal hearts will have something to say against it; but divine truths must be cleared from cavil. Object. 1. If Jew and Gentile stand so much upon the same level before God, what advantage then hath the Jew?

Commenting on Romans 3:1-18

John Gill Reformed Baptist @doctorgill

God forbid, yea, let God be true, but every man a liar,.... Let no such thing ever enter into the minds of any, that the truth of God can be, or will be made of none effect by the want of faith in man; let it be always asserted and abode by; that God is true, faithful to his word, constant in his promises, and...