The blood of the lamb.
And they shall take of the blood, and strike it on the two side posts and on the upper door. KJV
While held captive in Egypt, God told Moses to have the people slay a lamb without blemish. They were to take the blood and strike it on the side posts, and over the top of the door. The lamb they were to roast and eat with unleavened bread and bitter herbs. God would pass through the land of Egypt that night , and smite all the firstborn in the land of Egypt, both man and beast. When He seen the blood He would pass over that house. Were there fears as they hid behind closed doors that night? Did they trust God to do what Moses asked of them? Did they fully understand?
In Luke 22:19-20 we read again of the shed blood and the unleavened bread. This is the last supper, and Jesus is telling His disciples to drink the fruit of the vine as His blood that would be shed for them, and to eat the bread that represented His body. They did as instructed, but did they full understand this time. In both instances the blood from the Lamb was slain to protect them. One was the door post, and the other was the Cross.
Heavenly Father, I thank you for the grace that came to me because of the Cross. I did not deserve the love you gave so freely. Help me to always remember that when I stay behind the shed blood, you will pass over and I will be with you in eternity