Every Chareidi Jewish woman is barred from learning Judaic texts. If you’re in an insular chassidish enclave, that means never learning to read a Chumash. If you’re in Bais Yaakov, it means you can only learn excerpts of Talmud on an as-needed basis from photocopies.
We all know why. Because somewhere in the Talmud it says that any man who teaches his daughter Torah, it’s as if he taught her “tiflus.”
Very few of us have seen that quote in context because, well, it’s in the Talmud and we can only learn excerpts on an as-needed basis from photocopies.
Nobody every photocopied that page for us.
So here is the page from a Mishnayos. I have rendered a rough translation. You can confirm it yourself in any way you’d like.
And you can decide for yourself if it is relevant to you, and your Torah study, today.
Background, this is in Mesechet Sotah. The discussion is the test to determine whether a woman is guilty of infidelity by giving her special water to drink in the Beis Hamikdash.
If she has a merit, it [the effects of the waters] will be suspended. There are [some kinds of] merit [that] will suspend it for a year. There are [some kinds of] merit [that] will suspend it for two years. There are [some kinds of] merit [that] will suspend it for three years.
From here Ben Azai says: A man is obligated to teach his daughter Torah, so that if she drinks [the sotah waters] he knows that the merit [of her Torah learning] will suspend [the punishment] for her.
Rabi Eliezer says: Anyone who teachers his daughter Torah, it’s as if he’s taught her “tiflus.” [licentiousness.]