כֹּ֥ה אָמַ֛ר יְהוָ֥ה צְבָא֖וֹת אֱלֹהֵ֣י יִשְׂרָאֵ֑ל עֹלוֹתֵיכֶ֛ם סְפ֥וּ עַל־זִבְחֵיכֶ֖ם וְאִכְל֥וּ בָשָֽׂר׃
Thus saith the LORD of hosts, the God of Israel: Add your burnt-offerings unto your sacrifices, and eat ye flesh.
Read midrashic interpretation of Jeremiah 7:21: and classical rabbinic exegesis.