Then God said, “I'm going to give you a sign to confirm the agreement I'm making between me and you and all living creatures, an agreement that will last for all generations.
The blood on the houses where you live will mark them out. When I see the blood, I will pass over you. No deathly plague will fall on you to destroy you when I attack Egypt.
So now promise me in the name of the Lord that because I have acted in good faith to you, then you will do the same for my family. Give me some sign that I can trust you,