3 But since the writings (literæ) of Moses are the words of Christ, He does Himself declare to the Jews, as John has recorded in the Gospel: “If you had believed Moses, you would have believed Me: for he wrote of Me. But if you believe not his writings, neither will you believe My words.” He thus indicates in the clearest manner that the writings of Moses are His words. If, then, [this be the case with regard] to Moses, so also, beyond a doubt, the words of the other prophets are His [words], as I have pointed out. And again, the Lord Himself exhibits Abraham as having said to the rich man, with reference to all those who were still alive: “If they do not obey Moses and the prophets, neither, if any one were to rise from the dead and go to them, will they believe him.”
Source: Adversus haereses (New Advent)