The Book of Exodus tells us that the Israelites were instructed to mark their doorposts with blood so that God would "pass over" their homes during the tenth plague, sparing their firstborn sons (Exodus 12:23). But have you ever stopped to ask why? If God was all-powerful, didn’t He already know who was inside each house? Why the need for a sign?
That’s the question that Shemot Rabbah, a classic collection of rabbinic interpretations on the Book of Exodus, wrestles with. It quotes the verse "And the Lord will pass over the door" (Exodus 12:23) and then adds an incredible detail: "at that moment, as it were, He stood at the entrance."
Think about that for a moment. God, standing right there, at the doorway.
So, if God Himself was present, why the blood? Shemot Rabbah offers a fascinating analogy: Imagine a slaughterer marking the sheep he intends to slaughter with red paint. This helps him distinguish between those destined for slaughter and those to be spared. Similarly, the text suggests, God "will see the blood" (Exodus 12:23). But not to learn who to save. Instead, it’s "as it were, He stood at the entrance and repelled the destroyer so that it would not smite Israel."
The blood, then, wasn't a signal to God, but a shield. A shield against the mashchit, the destroyer. God's presence, coupled with the sign of the blood, actively held back the forces of destruction. It's a powerful image, isn't it? God not just allowing salvation, but actively intervening.
And the story doesn't end there. God tells the Israelites, "You shall observe this matter as an ordinance for you and for your sons forever" (Exodus 12:24). This isn't just a one-time event, but a pattern for all time. As Shemot Rabbah continues, God promises: "Just as I did for you now, so I am destined to do for you in the future."
The text then connects this promise to the words of the prophet Malachi (3:19), who speaks of a future day that "burns as a furnace," a time of intense judgment. Yet, even in that fiery future, God promises, "I will have mercy on them, as a man has mercy on his son" (Malachi 3:17).
So, what does it all mean? It suggests that the Exodus wasn't just a historical event, but a template for God's ongoing relationship with us. Just as God stood at the door in Egypt, protecting the Israelites, so too will He stand with us in the future, offering mercy and protection even in the face of destruction. The idea is that even in moments when the world feels chaotic and overwhelming, that protective presence remains, a constant source of hope and reassurance.