Keeping Torah Before it was Given
As we all know, the Torah was given at Mt. Sinai, long after the life of Yaakov. But Yaakov is said to have studied Torah at the Yeshiva of Shem and Eber. How is that possible that he could study Torah when the Torah had not been given yet, and when the Torah mostly describes events that took place after his lifetime? How is it possible that the concept of a yeshiva existed then when there were so few monotheists in the world who had Torah values?