And of course, Isaac is going to be the descendant that continues with this covenant and eventually into Israel. But in terms of testing the covenant, God actually, in the Old Testament, asks Abraham to kill his son Isaac. You got to kill your son Isaac to show how much you're going to listen to me. And right before he kills him, God's like, psych! He says, I'm an angry God. I'm a jealous God. I'm also a merciful God.