15 I find in your letter yet another objection in these words: “And add, that among all the many prophets who had been before, there is no one who has quoted from another word for word. For they had no need to go a-begging for words, since their own were true. But this one, in rebuking one of these men, quotes the words of the Lord, 'The innocent and righteous shall you not slay.'” I cannot understand how, with all your exercise in investigating and meditating on the Scriptures, you have not noticed that the prophets continually quote each other almost word for word. For who of all believers does not know the words in Esaias? “And in the last days the mountain of the Lord shall be manifest, and the house of the Lord on the top of the mountains, and it shall be exalted above the hills; and all nations shall come unto it. And many people shall go and say, Come, and let us go up to the mountain of the Lord, unto the house of the God of Jacob; and He will teach us His way, and we will walk in it: for out of Zion shall go forth a law, and a word of the Lord from Jerusalem. And He shall judge among the nations, and shall rebuke many people; and they shall beat their swords into ploughshares, and their spears into pruning-hooks: nation shall not lift up sword against nation; neither shall they learn war any more.”
But in Micah we find a parallel passage, which is almost word for word: “And in the last days the mountain of the Lord shall be manifest, established on the top of the mountains, and it shall be exalted above the hills; and people shall hasten unto it. And many nations shall come, and say, Come, let us go up to the mountain of the Lord, to the house of the God of Jacob; and they will teach us His way, and we will walk in His paths: for a law shall go forth from Zion, and a word of the Lord from Jerusalem. And He shall judge among many people, and rebuke strong nations; and they shall beat their swords into ploughshares, and their spears into pruning-hooks: nation shall not lift up a sword against nation, neither shall they learn war any more.”
Again, in First Chronicles, the psalm which is put in the hands of Asaph and his brethren to praise the Lord, beginning, “Give thanks unto the Lord, call upon His name,” is in the beginning almost identical with Psalm cv., down to “and do my prophets no harm;” and after that it is the same as Psalm xcvi., from the beginning of that psalm, which is something like this, “Praise the Lord all the earth,” down to “For He comes to judge the earth.” (It would have taken up too much time to quote more fully; so I have given these short references, which are sufficient for the matter before us.) And you will find the law about not bearing a burden on the Sabbath day in Jeremias, as well as in Moses. And the rules about the passover, and the rules for the priests, are not only in Moses, but also at the end of Ezekiel. I would have quoted these, and many more, had I not found that from the shortness of my stay in Nicomedia my time for writing you was already too much restricted.
Your last objection is, that the style is different. This I cannot see.
This, then, is my defence. I might, especially after all these accusations, speak in praise of this history of Susanna, dwelling on it word by word, and expounding the exquisite nature of the thoughts. Such an encomium, perhaps, some of the learned and able students of divine things may at some other time compose. This, however, is my answer to your strokes, as you call them. Would that I could instruct you! But I do not now arrogate that to myself. My lord and dear brother Ambrosius, who has written this at my dictation, and has, in looking over it, corrected as he pleased, salutes you. His faithful spouse, Marcella, and her children, also salute you. Also Anicetus. Do you salute our dear father Apollinarius, and all our friends.
Source: Origen to Africanus (New Advent)