Jamieson, Fausset and Brown on Jeremiah 7:22

22. Not contradicting the divine obligation of the legal sacrifices. But, "I did not require sacrifices, unless combined with moral obedience" (Psa 50:8; 51:16, 17). The superior claim of the moral above the positive precepts of the law was marked by the ten commandments having been delivered first, and by the two tables of stone being deposited alone in the ark (De 5:6). The negative in Hebrew often supplies the want of the comparative: not excluding the thing denied, but only implying the prior claim of the thing set in opposition to it (Ho 6:6). "I will have mercy, and not sacrifice" (1Sa 15:22). Love to God is the supreme end, external observances only means towards that end. "The mere sacrifice was not so much what I commanded, as the sincere submission to My will gives to the sacrifice all its virtue" [Magee, Atonement, Note 57].