When he seeth the blood upon the lintel, and on the two side-posts, Jehovah will pass over the door, and will not suffer the destroyer to come in unto your houses to smite you. Exodus 12.23.
What did God say regarding the blood thus applied by the Israelites? He declared: “When I see the blood, I will pass over you” (Ex. 12.13). How significant is this word! The “I” is God himself. Passover therefore means that God passes over when He sees the blood. It is God who sees the blood, not the people who put it on. We will never see the full value of the blood of our Passover Lamb because we are inside the door, whereas the Blood is applied to the outside of the door. So that the Blood is not seen by us, because it is not given to us to see. We must consequently use faith. Though we may not see it or feel it, we simply believe, for the Blood is for God to see. The essential matter for us is: has the Blood been applied? If it has been applied, there is no more need to be worried.