From McSweeney’s, it’s Genesis, the Rollout:

God said, “I will make man someone to shop with,” and made a woman. God brought the woman to the man, who said, “She is bone of my bone. She will be called ‘wo-man,’ for she is a tie-in.” God said, “Man and woman shall be as one flesh, a Buy One Get One Free. Be fruitful, multiply, and enjoy the Everyday Low Pricing.”