Final answer:
In the book of Deuteronomy, Moses explains the essence of the covenant between the Hebrew people and Yahweh. He emphasizes the importance of exclusive worship of Yahweh and obedience to the commandments as the condition for Yahweh's guarantee of prosperity in the promised land.
Step-by-step explanation:
In the book of Deuteronomy, Moses delivers a series of speeches to the Hebrew people in which he explains the essence of the covenant between them and Yahweh, their God. He emphasizes the importance of exclusive worship of Yahweh and obedience to the commandments as the condition for Yahweh to guarantee their prosperity in the promised land. Moses also warns against straying from the covenant and worshiping other gods, attributing the Hebrews' defeats to such actions.