Jewish Philosophy on Nehemiah 13:17: Rambam & Classical Sources

וָאָרִ֕יבָה אֵ֖ת חֹרֵ֣י יְהוּדָ֑ה וָאֹמְרָ֣ה לָהֶ֗ם מָֽה־הַדָּבָ֨ר הָרָ֤ע הַזֶּה֙ אֲשֶׁ֣ר אַתֶּ֣ם עֹשִׂ֔ים וּֽמְחַלְּלִ֖ים אֶת־י֥וֹם הַשַּׁבָּֽת׃

Then I contended with the nobles of Judah, and said unto them: ‘What evil thing is this that ye do, and profane the sabbath day?

Read Jewish philosophy on Nehemiah 13:17: Rambam's Guide for the Perplexed, Saadia Gaon, and classical Jewish philosophical sources, free online.