חָזְק֥וּ עָלַ֛י דִּבְרֵיכֶ֖ם אָמַ֣ר יְהוָ֑ה וַאֲמַרְתֶּ֕ם מַה־נִּדְבַּ֖רְנוּ עָלֶֽיךָ׃
“Kata-katamu terlalu keras terhadap-Ku,” firman Yang Mahakekal. Namun kamu berkata, “Apa yang telah kami bicarakan terhadap-Mu?”
Rashi
Oppressed the Bnei Yisroel intensely. R' Tanchuma expounded, through ridicule. Similarly, it is said, "Your remarks offend me intensely."2Malachi, 3:13. Vs. 14, 15 there define the offensive remarks as ridicule of the worship of Adonoy.