Exodus 12:12-14 Holman Christian Standard Bible (HCSB)
12 “I will pass through the land of Egypt on that night and strike every firstborn male in the land of Egypt, both man and beast. I am Yahweh; I will execute judgments against all the gods of Egypt. 13 The blood on the houses where you are staying will be a distinguishing mark for you; when I see the blood, I will pass over you. No plague will be among you to destroy you when I strike the land of Egypt.
14 “This day is to be a memorial for you, and you must celebrate it as a festival to the Lord. You are to celebrate it throughout your generations as a permanent statute.