Okay, so this is the scene: Abraham is old and he has just one son to whom a promise has been made (this is the biblical version, by the way). God had promised him that he’d have as many descendants as the stars in the sky, so it seem that Isaac has a long way to go. And the boy’s not married yet. Abraham calls in his trusted servant and gives lengthy, detailed instructions on how to go back to ancestral Iraq and find a wife for Isaac. Just to make sure the servant understands just how serious this is, Abraham says, “Put, I pray thee, thy hand under my thigh,” (I can’t help thinking he added a big wink) and instructs him to swear to obey the instructions precisely. Readers of the Bible since at least the Middle Ages have recognized that “thigh” here really means genitals. The more we’ve learned of the ancient world the more we’ve discovered that men touching each other’s privates was a sign of a most serious oath—it’s a touch that can’t be taken back, and any promises made in this way must be kept.
I’ve been reading about monkeys. More precisely, about evolution. When reading about how baboons show intent to form an alliance, I was surprised to learn that males utilize scrotum-grasping. Since all’s fair in love and war, when baboons fight ripping off another guy’s jewels is considered perfectly acceptable. That means that allowing another male to fondle your testicles is a sign of ultimate trust. Baboons, it seems, have been doing it long since before Abraham showed up on the scene. I wonder if this then is a case of convergent evolution of whether Abraham’s oath goes back to nature in its most basic form. Once castrated, especially in antiquity, a man had no choice about going back. To invite another man to put his hands “down there” was a serious matter indeed.
The only requirement really given to Abraham by God was circumcision. Again, from what we know of ancient times this was not unique to Israel, but the theological freight associated with it was. For a man who’s been promised as many descendants as the sand on the sea shore, allowing another man to cut away part of your reproductive organs is a sign of ultimate trust. This is a behavior that seems not to go back to nature, however. Not even chimpanzees have quite figured out how to make knives or use them to carve up sensitive areas. This has none of the marking of evolution. An act like that seems to have come directly from the gods. Abraham, in a way most modern believers would find incomprehensible, was the paragon of faith.

