In our Torah portion this week (i.e., parashat Bo) we read about the institution of the Passover and the final terrible plague that was to befall the Egyptians on the Passover night. When we think of this time, we may imagine God “passing over” those houses that had the blood of the lamb smeared on their doorposts, though it might better be said that God passed into the homes of those who trusted him, while he withdrew His Presence from those that did not…
To see this note that two different words are used that can be translated as “pass over.” First, God said, “I will pass over (i.e., avar: עֲבַר) the land of Egypt that night, and I will strike all the firstborn in the land of Egypt, both man and beast; and on all the gods of Egypt I will execute judgments; I am the LORD” (Exod. 12:12). But directly after saying this, God promised to “pass over” (i.e., pasach: פָּסַח) the homes of those who trusted in him to impart his protection from the plague of death: “The blood shall be a sign for you, on the houses where you are. And when I see the blood, I will pass over to you (lit. עֲלֵכֶם, ‘upon you’), and no plague will befall you to destroy you, when I strike the land of Egypt” (Exod. 12:13). In other words, when God would see the blood of the Passover lamb, he would pass over to enter the house and “cover” its occupants from the judgment of death.