In Exodus 12:22-23 and 27, God commands the Israelites not to go out of the house during the Passover, a directive laden with profound symbolism for us today. The door, representing the entire house, is central to this instruction, with emphasis placed on the blood applied to the doorposts and lintel. If the destroying angel could not pass the door marked by blood, he could not enter the house, ensuring safety within. Historical insights suggest the Passover lamb was slain at the door, its blood puddling on the threshold, then splashed on the doorposts and lintel using hyssop, completely surrounding the entrance with blood. This ensured no entry for the destroyer, as the blood formed an impenetrable barrier. God's specific command not to leave until morning preserves this powerful type, teaching a vital lesson for us in times of trouble: remain within the protective bounds symbolized by the house and the blood.

In the account of the Passover, as detailed in Exodus 12:3-14, the significance of blood on the doorposts emerges as a powerful symbol of protection and redemption. On the tenth day of the month, each household was to select a lamb without blemish, a male of the first year, to be kept until the fourteenth day, when it was to be killed at twilight. The blood of this lamb was then to be taken and smeared on the two doorposts and the lintel of the houses where the Passover meal was eaten. This act served as a sign, for the Lord declared that upon seeing the blood, He would pass over those houses, sparing them from the plague that would strike the firstborn in the land of Egypt. Thus, the blood on the doorposts became a shield against destruction, ensuring the safety of those within as the Lord executed judgment against the gods of Egypt. This day was to be kept as a memorial, a feast to the Lord throughout all generations, by an everlasting ordinance.

In the narrative of Exodus 12:22-23, the instruction is given to take a bunch of hyssop, dip it in the blood in the basin, and strike the lintel and the two doorposts with the blood. None shall go out of the door of their house until morning, for the LORD will pass through to strike the Egyptians. When He sees the blood on the lintel and the doorposts, the LORD will pass over the door and not allow the destroyer to enter the houses to strike them. As further explained in Exodus 12:27, this act is the Passover sacrifice of the LORD, who passed over the houses of the children of Israel in Egypt when He struck the Egyptians and delivered their households. The door in this context represents the entire house, signifying that if the death angel could not pass the door, it could not enter the house. There is an indication from ancient art and Jewish scholarship that the Passover lamb was originally killed at the door of the house, with the blood draining directly onto the threshold rather than into a basin. This is supported by the similarity between the Hebrew words for threshold and basin, as seen in the Septuagint translation which uses threshold. If true, the death angel would have been surrounded by blood on the threshold, doorposts, and lintel, emphasizing the protective barrier. The command to remain inside until morning carries a symbolic weight, suggesting a period of safety and waiting within the protected space. This act of applying blood to the doorposts and lintel serves as an object lesson, illustrating a principle of divine protection and deliverance through a concrete, acted-out event in the history of Israel.