Deuteronomy 3
The defeat of Og of Bashan, whose iron bed was nine cubits long, demonstrates the LORD's power over even the most formidable enemies and provides Israel with possession of the Transjordanian plateau. The distribution of land to Reuben, Gad, and half-Manasseh settles these tribes east of the Jordan, yet this settlement becomes a motif of incompleteness—they possess land but not the promised land proper. Moses' passionate plea to cross the Jordan is rejected on account of his sin at the waters of Meribah, a moment combining divine severity with mercy as Moses is commanded to ascend Pisgah and behold the land he will not possess. The public charging of Joshua as Moses' successor institutes prophetic succession and transfers the mantle of leadership, establishing the principle that covenant and conquest transcend individual leaders.
Deuteronomy 3:18
And I commanded you at that time, saying, 'The LORD your God has given you this land to possess it; you shall pass over armed before your brethren, the children of Israel, all the men of valor' -- the command to the eastern tribes (Reuben, Gad, half-Manasseh) requires military participation in the conquest of Canaan proper. Though they receive their inheritance east of the Jordan, they must fight with the western tribes. This clause prevents eastern settlement from becoming isolationist.
Deuteronomy 3:19
But your wives and your little ones and your livestock--I know that you have much livestock--shall abide in the cities which I have given you; -- the families and flocks remain in the Transjordanian territories while the warriors cross the Jordan. This arrangement allows the conquest to proceed while protecting vulnerable dependents.
Deuteronomy 3:20
Until the LORD gives rest to your brethren, as to you, and they also possess the land which the LORD your God is giving them beyond the Jordan; then you shall return every man to his possession, which I have given you -- the mandate is clear: military service continues until the western tribes are settled. Only then may the eastern tribes return to their families. The phrase 'rest' (menuchah) suggests that conquest's goal is secure settlement, not endless war.
Deuteronomy 3:21
And I commanded Joshua at that time, saying, 'Your eyes have seen all that the LORD your God has done to these two kings; so shall the LORD do to all the kingdoms into which you are about to go' -- Moses charges Joshua before all Israel, citing the victories over Sihon and Og as precedent. The pattern will repeat: the LORD defeats Israel's enemies. Joshua is encouraged by historical precedent.
Deuteronomy 3:22
You shall not fear them; for the LORD your God, he it is that fights for you' -- the command 'do not fear' is grounded in the assurance that the LORD is Israel's warrior. This theological certainty is the antidote to military anxiety. The fight is ultimately divine, not human.