Hear, O my people, and I will testify unto thee ... - See the notes at the similar passage in Psalms 50:7. God calls their attention to what he required of them; to what his law demanded; to what was the condition of their being his people and of securing his favor. What the demanded was, that they should acknowledge him; obey him; serve him; that there should be no strange god among them, and that they should worship no false god, Psalms 81:9.
Related Commentaries of Psalms 81:8
Psalms 81:8
8 Hear, O my people, and I will testify unto thee: O Israel, if thou wilt hearken unto me;