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 Psa 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 Psa 81:13, and some (f) take these words to be a wish, as there; "Israel, O that thou wouldest hearken unto me": see Isa 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.