וְשִׁבַּ֤חְתִּֽי אֲנִי֙ אֶת־הַשִּׂמְחָ֔ה אֲשֶׁ֨ר אֵֽין־ט֤וֹב לָֽאָדָם֙ תַּ֣חַת הַשֶּׁ֔מֶשׁ כִּ֛י אִם־לֶאֱכ֥וֹל וְלִשְׁתּ֖וֹת וְלִשְׂמ֑וֹחַ וְה֞וּא יִלְוֶ֣נּוּ בַעֲמָל֗וֹ יְמֵ֥י חַיָּ֛יו אֲשֶׁר־נָֽתַן־ל֥וֹ הָאֱלֹהִ֖ים תַּ֥חַת הַשָּֽׁמֶשׁ׃
So I commended mirth, that a man hath no better thing under the sun, than to eat, and to drink, and to be merry, and that this should accompany him in his labour all the days of his life which God hath given him under the sun.
Read halakhic rulings (Jewish law) on Ecclesiastes 8:15 from the Mishneh Torah and classical halakhic sources, free online.