Charles Spurgeon Commentary Exodus 12:12-13

"For I will go through the land of Egypt in that night, and will smite all the first-born in the land of Egypt, both man and beast; and against all the gods of Egypt I will execute judgments: I am Jehovah. And the blood shall be to you for a token upon the houses where ye are: and when I see the blood, I will pass over you, and there shall no plague be upon you to destroy you, when I smite the land of Egypt." — Exodus 12:12-13 (ASV)

For I will pass through the land of Egypt this night, and will smite all the firstborn in the land of Egypt, both man and beast; and against all the gods of Egypt I will execute judgment: I am the LORD. And the blood shall be to you for a token upon the houses where you are: and when I see the blood, I will pass over you.

What a grand gospel statement that is! When the sinner sees the blood, it is for his comfort; but it is God's sight of the blood that is, after all, the grand thing; and when is it that He does not see it?