Faced with the request of the tribes of Gad and Reuben to settle outside the promised borders, Moses perceives an existential and historical threat. He initially suspects that these tribes are attempting to avoid the difficult war of conquest ahead. In reality, their plan is entirely different. They intend to act as the vanguard, leading the military charge. By leaving their families and possessions behind, they can travel light and move swiftly. Unlike the rest of the Israelites, who are burdened by women, children, and heavy equipment, these unhindered warriors can rush ahead to secure the vital river crossings for the upcoming battles [בכור שור].
Unaware of this strategy at first, Moses delivers a sharp rebuke, characterizing the tribes as an offspring of sinners. This concept implies a process of growth and reproduction, suggesting they are grown adults who were raised and educated by sinful parents [אבן עזרא, רש״ר הירש, ביאור שטיינזלץ]. Another perspective views them as students faithfully walking in the destructive path of their teachers [נתינה לגר]. This emphasizes the dangerous transmission of negative traits from one generation to the next. Moses fears that the refusal to enter the land is not a mere one-time mistake but a deeply ingrained flaw, especially since the previous generation failed repeatedly over forty years in the wilderness without correcting their behavior [קונטרס חיבה יתירה].
Moses warns them that their actions will only add to God's fierce anger. The primary approach among commentators is that this represents a direct increase and expansion of divine wrath. Moses argues that if God was so deeply angered by their fathers, His fury will be even greater against them now. The divine anger over the original sin of the spies has not completely faded. By making this request, the new generation is essentially stepping into their fathers' shoes, continuing the abandonment of their national duty, and throwing more wood onto an already burning fire [מלבי״ם, רש״ר הירש].
Beyond the immediate conflict, Moses' harsh words carry a moral lesson regarding how to speak of the deceased. An early tradition notes that God actually criticized Moses for speaking negatively about the wilderness generation who had already passed away. God instructed Him to visit their graves and ask for their forgiveness. This incident serves as the foundation for the practice that anyone who speaks poorly of the dead in front of an audience must go to their grave and seek their pardon to make amends [פענח רזא].