The Feast of the Passover: To Commemorate The: Passing Over the First-Born
Source: TTT
Exodus 12:12, 13
On that night I will pass through the land of Egypt and strike down every firstborn male, both man and beast, and I will execute judgment against all the gods of Egypt. I am the LORD. / The blood on the houses where you are staying will distinguish them; when I see the blood, I will pass over you. No plague will fall on you to destroy you when I strike the land of Egypt.