Yeshayahu 29:13 reads:
וַיֹּ֣אמֶר אֲדֹנָ֗י יַ֚עַן כִּ֤י נִגַּשׁ֙ הָעָ֣ם הַזֶּ֔ה בְּפִ֤יו וּבִשְׂפָתָיו֙ כִּבְּד֔וּנִי וְלִבּ֖וֹ רִחַ֣ק מִמֶּ֑נִּי וַתְּהִ֤י יִרְאָתָם֙ אֹתִ֔י מִצְוַ֥ת אֲנָשִׁ֖ים מְלֻמָּדָֽה׃ Forasmuch as this people draw near, and with their mouth and with their lips do honour Me, but have removed their heart far from Me, and their fear of Me is a commandment of men learned by rote.
Could someone explain me the meaning of the words: 'their fear of Me is a commandment of men learned by rote'?
These words reminded me of the people whom stood at Har Sinai, they feared HaShem, they proclaimed the famous words 'na'aseh v'nishma', but their hearts seem to be far from Him at the moment they made the calf. Are their any commentators connecting this verse from Yeshayahu and the story of the chet ha'egel?