Numbers 26:19

Misinterpretations often distort Onan's death as divine punishment for masturbation or contraception in general, ignoring the specific context of his deliberate refusal to provide an heir for his brother Er under levirate law, which was seen as selfish defiance against family and God-given duty. Another error views the verse in isolation as a moral treatise on sexuality rather than a concise genealogical notation in the tribal census, leading to unfounded modern applications; it neither endorses nor details sexual practices but simply excludes the deceased from the count of able-bodied warriors.

Numbers 26:19 identifies Er and Onan as sons of Judah who died in Canaan, alluding to their earlier judgments by God—Er for his unspecified wickedness and Onan for refusing levirate duty by spilling his seed. Within the second wilderness census, this verse clarifies that only surviving descendants through Perez and Zerah form Judah's clans for military and inheritance purposes, emphasizing divine justice, the consequences of sin even in prominent families, and God's faithfulness in preserving the messianic line through Judah.