Hear, O my people— The prophet here, as in Psalms 50:5 introduces God the Father, speaking to the church. I will testify against thee, is rendered by Castalio, while I give thee this notice; namely, "of my establishing a new law with the members of the Christian church, and entering into a covenant of mercy with them, ratified and sealed by the death of my son." For I am thy God; i.e. in a more particular manner the God of the faithful; See Romans 6:8. In the 8th and five following verses is expressed the rejection of the sacrifices of beasts, and of the legal worship. I will not reprove thee, &c. means, "I do not complain of any negligence you have been guilty of, with relation to sacrifices, which were continually before me; punctually and regularly offered to me, according to the law; (See Numbers 28:31.) But I now testify unto you, and admonish you, that those sacrifices are to cease; since they were but types of the perfect sacrifice of Christ."
Related Commentaries of Psalms 50:7
Psalms 50:7-8
7 Hear, O my people, and I will speak; O Israel, and I will testify against thee: I am God, even thy God.
8 I will not reprove thee for thy sacrifices or thy burnt offerings, to have been continually before me.