Translated from the Greek original by Frederick Crombie.
The first book of our answer to the treatise of Celsus, entitled A True Discourse, which concluded with the representation of the Jew addressing Jesus, having now extended to a sufficient length, we intend the present part as a reply to the charges brought by him against those who have been converted from Judaism to Christianity.  And we call attention, in the first place, to this special question, viz., why Celsus, when he had once resolved upon the introduction of individuals upon the stage of his book, did not represent the Jew as addressing the converts from heathenism rather than those from Judaism, seeing that his discourse, if directed to us, would have appeared more likely to produce an impression.  But probably this claimant to universal knowledge does not know what is appropriate in the matter of such representations; and therefore let us proceed to consider what he has to say to the converts from Judaism. He asserts that "they have forsaken the law of their fathers, in consequence of their minds being led captive by Jesus; that they have been most ridiculously deceived, and that they have become deserters to another name and to another mode of life." Here he has not observed that the Jewish converts have not deserted the law of their fathers, inasmuch as they live according to its prescriptions, receiving their very name from the poverty of the law, according to the literal acceptation of the word; for Ebion signifies "poor" among the Jews,  and those Jews who have received Jesus as Christ are called by the name of Ebionites. Nay, Peter himself seems to have observed for a considerable time the Jewish observances enjoined by the law of Moses, not having yet learned from Jesus to ascend from the law that is regulated according to the letter, to that which is interpreted according to the spirit,--a fact which we learn from the Acts of the Apostles.
 [Comp. Justin, Dial. with Trypho (passim), vol. i., this series.]
Reference address : https://www.ellopos.net/elpenor/greek-texts/fathers/origen/against-celsus.asp?pg=83