John Chrysostom
Reuben's transgression becomes evident. It is written that Reuben went and had relations with Bilhah, his father's concubine. And Israel was informed. This act was indeed a grave offense. Consequently, Moses, the lawgiver, prohibited a father and son from engaging with the same woman to prevent it from becoming a practice, declaring such an act deserving of death (Lev. 20:11). Although Jacob quietly bore this shame, driven by a father's love, he later reproached his son upon his passing, clearly articulating his wrong and issuing a curse upon him (Genesis 49:4-5). The misfortune that befell Reuben served as a warning to the others.