Hear, O my people! The more effectually to touch the hearts of the people, God is here invested with the character of a teacher, and introduced as speaking familiarly in the midst of the congregation; and this is done for the purpose of instructing them, that all assemblies are unprofitable and trifling in which the voice of God stirring up men to faith and true godliness is not uttered. But let us proceed to the consideration of the words. This preface was intended to teach in a few words, that festival days were not purely and rightly observed unless the people listened with attention to the voice of God. In order to consecrate their hands, feet, eyes, and their whole persons, to his service, it behoved them, in the first place, to open their ears to his voice. Thus the lesson is taught that he acknowledges as his servants those only who are disposed to become learners. By the word protest he intimates that he covenants after a solemn manner, thereby to give his words the greater authority. The clause which follows, O Israel! if thou wilt hearken to me, is, I presume, an abrupt expression, similar to what is frequently employed in pathetic discourses, the ellipse serving to express the greater earnestness. Some connect it with the following verse in this way, O Israel! if thou wilt hearken to me, there will be no strange god in thee But it is rather to be viewed as the language of regret on the part of God. He indirectly intimates that he distrusts this obstinate and rebellious people, and can hardly indulge the hope that they will prove obedient and teachable.

Hear, O my people, and I will testify unto thee - See the notes at the similar passage in Psalm 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, Psalm 81:9.

Hear, O my people - These are nearly the same words with those spoken at the giving of the law, Exodus 20:2.

(h) Hear, O my people, and I will testify unto thee: O Israel, if thou wilt hearken unto me;
(h) He condemns all assemblies where the people are not attentive to hear God's voice, and to give obedience to the same.

Hear, O my people, and I will testify unto thee,.... Of himself, his being, and perfections; what he was unto them, had done for them, and would do for them, as in the following verses: or "testify in thee" (d), bear witness to their spirits, that they were his people, and he was their God; this is a witness which the people of God have in themselves; it is the inward testimony of the Spirit; besides which, there is the outward testimony of the word, and which also may be here meant; for it may be rendered,
I will give a testimony to thee: the law is a testimony of the will of God to his people, what he would have done, or not done; and the Gospel is a testimony of his grace, and the whole word testifies of Christ, his person, offices, obedience, sufferings, and death: some render it, "testify against thee" (e), for their murmurings, rebellion, and idolatry, as in Psalm 50:7 and they are called upon to hear the voice of God in his word, and in his providences, being his people; and as such he addresses them, which bespeaks interest in them, affection to them, and an acknowledgment of them, and carries in it a reason why they should hear him:
O Israel, if thou wilt hearken unto me; this explains who are meant by the Lord's people, Israel, the posterity of Jacob, a chosen and special people, who are exhorted not only to hear, but to hearken and to obey; suggesting, it would be well with them, if they did as in Psalm 81:13, and some (f) take these words to be a wish, as there; "Israel, O that thou wouldest hearken unto me": see Isaiah 48:18.
(d) "testificabor in te", Gejerus. (e) "Ut testificer contra te", Schmidt. (f) So Michaelis, and Gussetius, and Genevenses, in ib. Comment. Ebr. p. 431.

We cannot look for too little from the creature, nor too much from the Creator. We may have enough from God, if we pray for it in faith. All the wickedness of the world is owing to man's wilfulness. People are not religious, because they will not be so. God is not the Author of their sin, he leaves them to the lusts of their own hearts, and the counsels of their own heads; if they do not well, the blame must be upon themselves. The Lord is unwilling that any should perish. What enemies sinners are to themselves! It is sin that makes our troubles long, and our salvation slow. Upon the same conditions of faith and obedience, do Christians hold those spiritual and eternal good things, which the pleasant fields and fertile hills of Canaan showed forth. Christ is the Bread of life; he is the Rock of salvation, and his promises are as honey to pious minds. But those who reject him as their Lord and Master, must also lose him as their Saviour and their reward.

(Compare Psalm 50:7). The reproof follows to Psalm 81:12.
if thou wilt hearken--He then propounds the terms of His covenant: they should worship Him alone, who (Psalm 81:10) had delivered them, and would still confer all needed blessings.

Testify - This God did presently after he brought them from Meribah, even at Sinai.