At a grand public gathering, moments before the transfer of royal power, the entire nation receives a vital warning about the fundamental condition for their survival in their homeland. This charge goes beyond the leadership, encompassing the whole nation and establishing spiritual commitment as the absolute requirement for the right to dwell in the land.
The declaration is made openly in front of everyone, leaving no one out. It applies equally to all members of the nation, whether they are native-born citizens or foreigners who have joined them [רש"י]. Furthermore, this is not just a speech to the people; it is delivered as if standing directly before God. He is actively present at this gathering, serving as a witness to the nation's commitment [רש"י, מצודת דוד, רלב"ג].
The central demand to observe and pursue all of God's commandments is directed at the Israelites collectively as one unified group. This stands in contrast to the specific, personal instructions that King Solomon will receive later [רש"י]. The motivation behind this demand rests on a core spiritual principle. The greater the blessing God bestows upon a person, the greater the obligation to respond with dedicated service, humility, and obedience to His will [מלבי"ם].
There is general agreement among commentators that taking possession of the land is not an unconditional gift. It relies completely on the people's loyalty to God's path. Only by actively keeping the commandments can the nation secure its hold on the land, live there in safety, and pass this lasting inheritance down to their children for all generations.