It’s Shabbat Hagadol again, the “Great Shabbat” that precedes the seder. No one knows exactly how this anticipatory Shabbat got its name — no Jewish source uses it until the Middle Ages, by which time, no one remembered what it meant.
Vayikra (the first Torah portion in Leviticus) is about intimacy with God, and the responsibilities that come with that intimacy. But to understand what those responsibilities entail, we need to jump back much earlier, to the original state of Divine intimacy. We need to start with Adam and Eve in the Garden.