And therefore - His faith was so implicit, and so unwavering, that it was a demonstration that he was the firm friend of God. He was tried, and he had such confidence in God that he showed that he was supremely attached to him, and would obey and serve him. This was reckoned as a full proof of friendship; and he was recognised and treated as righteous; that is, as the friend of God. (The true sense of faith being imputed for righteousness is given in a note at the beginning of the chapter.) See the note at Romans 4:3, Romans 4:5.
Related Commentaries of Romans 4:22
Romans 4:22
22 And therefore it was imputed to him for righteousness.