The blood will be a sign for you on the houses where you are, and when I see the blood, I will pass over you. No destructive plague will touch you when I strike Egypt. (Exodus 12:13 NIV)
In Exodus the story is told of the Israelites exit from Egypt. On the last night, they were to kill a spotless lamb and paint its blood around the doorposts. When the angel of death came, it would “pass over” the houses with the blood of the lamb and they would be spared. The Israelites were to remember this every year during Passover. They celebrated with the Passover Feast. One word used for feast is miqra. It means rehearsal. They were to rehearse this until the true spotless Lamb of God came and died. Exodus 12:13 says “When I see the blood, I will pass over you. This plague of death will not touch you.” That’s what Jesus did for us. He is our “spotless Lamb.” God sees Jesus’ blood, we are forgiven and given eternal life.