Jerome

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But because the text was not found in Isaiah, his name was, I suppose, therefore erased by such as had observed that. But it seems to me that it was first written thus, ‘As was written by Asaph the Prophet, saying;’ for the seventy-seventh Psalm out of which this text is taken is ascribed to Asaph the Prophet; and that the copyist not understanding Asaph, and imputing it to error in the transcription, substituted the better known name Isaiah. For it should be known that not David only, but those others also whose names are set before the Psalms, and hymns, and songs of God, are to be considered prophets, namely, Asaph, Idithum, and Heman the Esraite, and the rest who are named in Scripture. And so that which is spoken in the Lord’s person, I will open my mouth in parables, if considered attentively, will be found to be a description of the departure of Israel out of Egypt, and a relation of all the wonders contained in the history of Exodus. By which we learn, that all that is there written may be taken in a figurative way, and contains hidden sacraments; for this is what the Saviour is there made to preface by the words, I will open my mouth in parables.