Ante-Nicene Fathers, Vol VIII:
Pseudo-Clementine Literature.: Chapter XLVIII

Chapter XLVIII.—Test of Truth.

Then said Simon:  “Since, as you say, we must understand the things concerning God by comparing them with the creation, how is it possible to recognise the other things in the law which are from the tradition of Moses, and are true, and are mixed up with these falsehoods?”  Then Peter said:  “A certain verse has been recorded without controversy in the written law, according to the providence of God, so as to show clearly which of the things written are true and which are false.”  Then said Simon:  “Which is that?  Show it us.”