What does Exodus 12:7 mean?
Moses and Aaron (Exodus 12:1) are delivering instructions to Israel regarding the first Passover (Exodus 12:1–6). This will be a night of great pain for Egypt (Exodus 11:4–6), but nothing will happen to those who follow the Lord's instructions (Exodus 12:13). Each Israelite family is to set aside a flawless year-old male lamb and sacrifice it just after sunset on the fourteenth day of the month.Blood from the sacrificed lambs is then to be applied to the doorway of each home. Later verses mention a "basin" (Exodus 12:22). This was either the bowl used to collect the lamb's sacrificed blood, or a depression near the door meant to catch debris and rainwater. This blood was to be wiped onto the top and side posts of the doorway. Some commentators note that this instruction could create a bloody cross on the door (1 John 1:29; 1 Corinthians 5:7). Others do not think this was an intended part of the process. What's clear is that obedience in this area (Hebrews 11:28) marked that home as safe from God's brutal wrath (Exodus 12:13).
This sacrifice also creates a prophecy about the role of the Messiah (Genesis 3:15). Thousands of years later, Jesus Christ would come as the perfect sacrifice for human sin (John 1:29; 1 Corinthians 5:7). Those covered by His blood, by virtue of their faith, are also saved from God's eternal judgment on their sin (John 3:16–18, 36; Titus 3:5).