How much more impartial than Celsus is Numenius the Pythagorean, who has given many proofs of being a very eloquent man, and who has carefully tested many opinions, and collected together from many sources what had the appearance of truth; for, in the first book of his treatise On the Good, speaking of those nations who have adopted the opinion that God is incorporeal, he enumerates the Jews also among those who hold this view; not showing any reluctance to use even the language of their prophets in his treatise, and to give it a metaphorical signification.
It is said, moreover, that Hermippus has recorded in his first book, On Lawgivers, that it was from the Jewish people that Pythagoras derived the philosophy which he introduced among the Greeks. And there is extant a work by the historian Hecatæus, treating of the Jews, in which so high a character is bestowed upon that nation for its learning, that Herennius Philo, in his treatise on the Jews, has doubts in the first place, whether it is really the composition of the historian; and says, in the second place, that if really his, it is probable that he was carried away by the plausible nature of the Jewish history, and so yielded his assent to their system.
Source: Against Celsus (New Advent)