Charles Ellicott Commentary 1 Chronicles 28:8

"Now therefore, in the sight of all Israel, the assembly of Jehovah, and in the audience of our God, observe and seek out all the commandments of Jehovah your God; that ye may possess this good land, and leave it for an inheritance to your children after you for ever." — 1 Chronicles 28:8 (ASV)

Now therefore in the sight of all Israel. —Literally, And now to the eyes of all Israel ... and in the ears of our God; that is, I adjure you. David ends his address to the people by a solemn appeal, like that of Moses (Deuteronomy 4:26; Deuteronomy 30:19: I call heaven and earth to witness, etc.). David’s appeal is to the whole nation as represented before him, and to the God whose ear is ever open.

Seek — i.e., do not neglect; resort to them always as the rule of right living (same word as 1 Chronicles 13:3; 1 Chronicles 15:13).

That you may possess this (Heb. the) good land. —Another reminiscence of Deuteronomy (1 Chronicles 4:1; 1 Chronicles 4:21).

And leave it for an inheritance. —Leviticus 25:46.