What event in Hebrew history does Passover celebrate?

Answer:
The Hebrew people sprayed blood on the door of their houses in Egypt, and the angel passed by these houses. and the first born escaped. But the egyptians did not have it on their doors so their first born was slain.
First answer by Lalithgeorge. Last edit by Lalithgeorge. Contributor trust: 973 Question popularity: 4 [recommend question].