Final answer:
The word that best captures God's message to Israel in Deuteronomy, chapters 5-26, is 'obedience,' as these chapters highlight the importance of following God's laws and maintaining the covenant.
Step-by-step explanation:
The word that best expresses God's message to Israel in Deuteronomy, chapters 5-26, is obedience. In the historical context of the Hebrews and their relationship with Yahweh, as represented in these chapters, there is a strong emphasis on following the laws and commandments provided by God. In return for their obedience, God promises the Israelites a land of abundance and security. The laws, including the Ten Commandments, are conditional for maintaining the covenant and ensuring Yahweh's blessings, prosperity, and protection from enemies.