Deuteronomy 31:28

28 Assemble to me all the elders of your tribes and your officials, so that I may speak in their ears these words, and [that] I may call as witness against them heaven and earth.

Deuteronomy 31:28 Meaning and Commentary

Deuteronomy 31:28

Gather unto me all the elders of your tribes, and your
officers
The heads of the tribes, the princes, and all other inferior magistrates:

that I may speak these words in their ears;
not the words of the law, but of the song which he was ordered to write, and is recorded in the following chapter:

and call heaven and earth to record against them;
to bear witness of what he delivered to them, and to bear witness against them should they transgress the laws he gave them; and to bear witness that they had been faithfully cautioned against transgressing, and had been severely threatened, and the punishment plainly pointed out that should be inflicted on them in case of disobedience, so that they were left entirely without excuse.

Deuteronomy 31:28 In-Context

26 "Take the scroll of this law and put it at the side of the ark of the covenant of Yahweh your God, and it will be there as a witness against you.

27 For I know your rebellion and your stiff neck [even now] while I [am] still alive with you {today}, rebelling against Yahweh, and {how much more} after my death.

28 Assemble to me all the elders of your tribes and your officials, so that I may speak in their ears these words, and [that] I may call as witness against them heaven and earth.

29 For I know that after my death you will certainly act corruptly, and you will turn aside from the way that I have commanded you, and the disaster in the future days will befall you, because you will do evil in the eyes of Yahweh, {provoking him with the work of your hands}."

30 So Moses spoke into the ears of the assembly of Israel the words of this song {until they were complete}.