וְאַתֶּ֖ם מְחַלְּלִ֣ים אוֹת֑וֹ בֶּאֱמָרְכֶ֗ם שֻׁלְחַ֤ן אֲדֹנָי֙ מְגֹאָ֣ל ה֔וּא וְנִיב֖וֹ נִבְזֶ֥ה אָכְלֽוֹ׃
But ye profane it, In that ye say: ‘The table of the LORD is polluted, And the fruit thereof, even the food thereof, is contemptible.’
Read midrashic interpretation of Malachi 1:12: and classical rabbinic exegesis.