לָ֤מָּה צַּ֙מְנוּ֙ וְלֹ֣א רָאִ֔יתָ עִנִּ֥ינוּ נַפְשֵׁ֖נוּ וְלֹ֣א תֵדָ֑ע הֵ֣ן בְּי֤וֹם צֹֽמְכֶם֙ תִּמְצְאוּ־חֵ֔פֶץ וְכָל־עַצְּבֵיכֶ֖ם תִּנְגֹּֽשׂוּ׃
’Wherefore have we fasted, and Thou seest not? Wherefore have we afflicted our soul, and Thou takest no knowledge?’— Behold, in the day of your fast ye pursue your business, And exact all your labours.
Read halakhic rulings (Jewish law) on Isaiah 58:3: and classical halakhic sources.