Judah’s House in Crisis — Er, Onan, Tamar, and a Duty Refused
Genesis 38 interrupts the Joseph story to follow Judah, the brother who proposed selling Joseph rather than killing him. Judah separates from his brothers, marries a Canaanite woman, and becomes father to Er, Onan, and Shelah. Er is judged for wickedness. After Er dies, Judah commands Onan to fulfill the family duty of raising offspring for his dead brother. Onan knowingly takes the sexual relationship while deliberately preventing the offspring that would preserve his brother’s line; Genesis says this act displeased the LORD. The passage should therefore not be reduced to a proof-text about masturbation. Its stated issue is Onan’s calculated refusal to give seed to his brother while benefiting from the arrangement. Deuteronomy 25 later regulates a related brother-in-law duty, showing the broader concern for preserving the dead brother’s name, though Genesis 38 predates that law and is not identical to its later procedure. Judah then withholds Shelah from Tamar, leaving her trapped as a widow. The chapter is beginning Judah’s own moral exposure.