6 And ye shall keep it up until the fourteenth day of the same month: and the whole assembly of the congregation of Israel shall kill it in the evening.

7 And they shall take of the blood, and strike it on the two side posts and on the upper door post of the houses, wherein they shall eat it.

Not only would the Israelites eat the sacrificial lamb, but they were also to streak its blood across their doorposts. We will soon read how this unique practice would protect the Israelites from the death of their firstborn. The blood of the lamb was being used to mark a home as housing God’s people, and His favor and protection would be upon them. This is obviously representative of Christ, the Lamb of God, whose blood was shed to also make us God’s people, and to similarly mark us for His protection and favor.

This is not the only representation in the killing of the lamb, though. As we have already discussed, sheep were one of the creatures that the Egyptians worshipped. God had already mocked that pagan worship by sending the murrain that killed their sacred flocks, now He would mock them again by having His people sacrifice the animals right before the Egyptians. Perhaps the Israelites would normally have been harmed for doing this, if not for the humbling that God would put upon the Egyptians immediately after.

Another possible symbol in killing the lamb and streaking its blood on the posts might have been that the lamb was innocent and young, just like the Israelite baby boys that the prior Pharaoh had ordered to be killed and thrown into the river. At the start of Moses’s campaign against the Egyptians he had drawn the blood out of the river, presumably to show that Egypt’s sins had not been hidden and washed away. God still remembered that evil and He had come to recompense. Thus, slaying the lamb and painting their doorposts with its blood might have been a way for the Israelites to signify that “we have already had our young and innocent slaughtered, therefore pass us over in this next doling out of death.”