The accumulation of sins across multiple generations creates a heavy moral burden that ultimately demands a divine response. A profound accounting takes place, weaving together the wrongdoings of the present generation with the historic crimes of their ancestors. The primary approach among commentators is that God will exact a combined penalty for the sins of both parents and children, as it is precisely this union of guilt that causes the exile to drag on [רד״ק]. Others view this accounting as a continuous record, noting that the transgressions of both eras remain permanently written before God [שד״ל], highlighting how the children actively added to the corrupt foundation laid by their ancestors [אבן עזרא].
The historic sins in question revolve heavily around idolatry. The ancestors openly burned incense to false gods [רד״ק, מצודת דוד, ביאור שטיינזלץ]. They did not hide their actions but performed these rituals publicly on the mountains [מצודת דוד], committing a fundamental betrayal of faith that served as a direct insult to God [רד״ק]. In a vivid depiction of this rebellion, the ancestors are described as standing upon the high mountains to offer incense to idols, while taking to the lower hills to hurl curses and blasphemy toward heaven [מלבי״ם]. Their behavior is characterized by deep contempt, cursing, and shaming [מצודת ציון, ביאור שטיינזלץ].
When the time for justice arrives, God carefully calculates the penalty. This process is compared to measuring out a worker's wages. Just as an employer pays a laborer for their effort, God measures out the exact punishment earned by their actions [שד״ל, ביאור שטיינזלץ].
A debate exists regarding the sequence of this divine justice. One perspective suggests that God will first punish the children for their own present failures before holding them accountable for their ancestors' crimes. This is either because the children willingly perpetuated their parents' destructive path [מצודת דוד], or because the children's sins are actually considered worse, having been committed with hypocrisy and deceit, unlike the blatant rebellion of their parents [מלבי״ם]. Conversely, another approach maintains that the punishment is applied to the ancestors first, followed by the children [רד״ק], reflecting the historical reality that the ancestors were the very first to be sent into exile because of their idolatry [אבן עזרא, שד״ל]. Additional interpretations suggest that God evaluates their deeds from the very beginning, ensuring that their earned penalty is paid in full [ביאור שטיינזלץ].