Irenaeus 

“Human beings can be saved from the ancient wound of the serpent in no other way than by believing in him who, when he was raised up from the earth on the tree of martyrdom in the likeness of sinful flesh, drew all things to himself and gave life to the dead.” (Against the Heresies, IV, 2, 7)

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“For ‘Abraham believed God, and it was counted unto him for righteousness.’ In like manner we also are justified by faith in God: for ‘the just shall live by faith.’ Now ‘not by the law is the promise to Abraham, but by faith’ for Abraham was justified by faith: and ‘for a righteous man the law is not made.’ In like manner we also are justified not by the law, but by faith, which is witnessed to in the law and in the prophets” (Demonstration of the Apostolic Preaching, Chapter 35).