From D.A. Carson’s book Scandalous: The Cross and Resurrection of Jesus.
This illustration makes it very clear what it means to be a Christian. It shows what it means to be found in Christ, to rest in him, to be covered by his blood:
Picture two Jews with the remarkable names of Smith and Jones. They live in the land of Goshen almost a millennium and a half before Christ. It is early evening, and they are talking to each other near the end of the ten plagues. Mr. Smith says to Mr. Jones, ‘Mr. Jones, have you daubed the two doorposts and the lintel with the blood of the lamb tonight?’
Mr. Jones replies, ‘Oh, yes, I certainly have. You heard what Moses said. The angel of death is passing through the land. Some of the plagues have afflicted just the Egyptians, but some of them have been over the whole land. Moses insisted that this plague was going to run throughout the entire land of Goshen where we live, as well as the rest of Egypt. The firstborn of people and of cattle are going to be killed. The only exceptions are in those homes that have been daubed with the lamb’s blood, the way Moses prescribed.’ He pauses and then adds, ‘I’m really excited about this because this means that our redemption is drawing near. Of course, I’ve slaughtered the lamb. My friends and relatives are all here, and we’re ready to go. I’ve daubed the blood of the lamb on the two doorposts and on the lintel. How about you, Mr. Smith?’
Mr. Smith replies, ‘Well, of course, I’ve done the same thing. But boy, am I worried. Have you seen the things that have gone on around here the last few months? Frogs, lice, hail, death. Now Moses is talking about every firstborn. Look, I’ve only got one son; you’ve got three. I love my Charlie, and I don’t want to lose him. I’m scared witless. There’s not going to be any sleep for me tonight.’
Rather surprised, Mr. Jones replies, ‘What are you worried about? God himself has promised through his servant Moses that if you daub the blood on the two doorposts and on the lintel, you are saved. Your child will be saved. Charlie will be here tomorrow morning. You’ve already put the blood on the two doorposts and on the lintel.’
Mr. Smith replies, ‘Well, you’ve got that last bit right. I’ve certainly done that, but I’m scared witless just the same.’
That night the angel of death passes through the land. Who loses his son? Mr. Smith or Mr. Jones?
The answer, of course, is neither–because the promise was based not on the intensity of their faith nor on the joy of their obedience but on whether or not they hid under the blood of the lamb.