I could not find it but i read it in Reddit AskHistorians many years ago. I am afraid to search further as I could get flagged 😂 Fwiw, if I remember correctly, I think the name of the Jewish historian is Josephus. But the only reference from the Internet I could find about him and his comment on pederasty/pedophilia is from here https://voice.dts.edu/review/philo-josephus-and-the-testaments-on-sexuality-attitudes-towards-sexuality-in-the-writings-of-philo-and-josephus-and-in-the-testaments-of-the-twelve-patriarchs/