As Passover begins, Noah Feldman, Harvard law professor, founding director of the Julis-Rabinowitz Program on Jewish and Israeli Law, and the author of To Be a Jew Today: A New Guide to God, Israel, and the Jewish People (Macmillan, 2024), talks about his new book, inspired by his conversations with his children and even more relevant since 10/7, that tries to define what all Jews have in common.