Charles Spurgeon Commentary Exodus 12:13-15

"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. And this day shall be unto you for a memorial, and ye shall keep it a feast to Jehovah: throughout your generations ye shall keep it a feast by an ordinance for ever. Seven days shall ye eat unleavened bread; even the first day ye shall put away leaven out of your houses: for whosoever eateth leavened bread from the first day until the seventh day, that soul shall be cut off from Israel." — Exodus 12:13-15 (ASV)

And the plague shall not be upon you to destroy you, when I smite the land of Egypt. And this day shall be unto you for a memorial, and ye shall keep it a feast to the Lord throughout your generations; ye shall keep it a feast by an ordinance for ever. Seven days shall ye eat unleavened bread; even the first day ye shall put away leaven out of your houses: for whosoever eateth leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.

Therefore he was no partaker in the redemption purchased by blood. He who is not purged from hypocrisy may say what he likes, but the blood will not save him unless he repents. There must be the putting away of this leaven of the Pharisees, which is hypocrisy, or else even the blood of atonement will not avail.