Moses
Genesis 15:6ESV·traditional attribution

And he believed the LORD, and he counted it to him as righteousness.

John Calvin Reformed @genevareformer

6. And he believed in the Lord . None of us would be able to conceive the rich and hidden doctrine which this passage contains, unless Paul had borne his torch before us. (Romans 4:3.) But it is strange, and seems like a prodigy, that when the Spirit of God has kindled so great a light, yet the greater part of interpreters wander with closed...

Matthew Henry Presbyterian @wholebiblehenry

We have here the assurance given to Abram of a numerous offspring which should descend from him, in which observe, I. Abram's repeated complaint, Gen 15:2, Gen 15:3. This was that which gave occasion to this promise. The great affliction that sat heavy upon Abram was the want of a child; and the complaint of this he here pours out before the Lord, and shows...

Commenting on Genesis 15:2-6

John Gill Reformed Baptist @doctorgill

And he believed in the Lord,.... The Targums of Onkelos and Jonathan are,"in the Word of the Lord;''in the essential Word of the Lord, in Christ the Lord his righteousness; he believed in the promise of God, that he should have a seed, and a very numerous one; he believed that the Messiah would spring from his seed; he believed in him as his Saviour...