 Because there was no such thing as death. So he explained to them what that meant. They violated it anyway. Passive listening. And if you'll think about, for example, how God has spoken to people all down through the years, and people have listened. He said to Noah, build an ark. Suppose Noah said, you know, I think I heard God say something about building some boat, but I must have misunderstood it. No. God said build an ark if he hadn't, he'd have drowned. He said to Abraham, get up out of your country into a land that I will show you.