Commentaries:
Jeremiah 31:34 foretells that under the New Covenant, God would not remember sins and lawless deeds. Simply put, sins are not remembered because they have been borne to the “land of forgetfulness.”
The author then takes the explanation a step farther, showing that once remission of sin has been accomplished, there is “no longer an offering for sin.” That is, the role of the azazel—the second part of the compound offering for sin (Leviticus 16:5)—has already been fulfilled! We already have remission of sins; there is not a future fulfillment of any sin offering that those who are already under Christ's blood should be waiting for.
David C. Grabbe
Who Fulfills the Azazel Goat— Satan or Christ? (Part Three)