כֹּ֠ל אֲשֶׁ֨ר תִּמְצָ֧א יָֽדְךָ֛ לַעֲשׂ֥וֹת בְּכֹחֲךָ֖ עֲשֵׂ֑ה כִּי֩ אֵ֨ין מַעֲשֶׂ֤ה וְחֶשְׁבּוֹן֙ וְדַ֣עַת וְחָכְמָ֔ה בִּשְׁא֕וֹל אֲשֶׁ֥ר אַתָּ֖ה הֹלֵ֥ךְ שָֽׁמָּה׃ (ס)
Whatsoever thy hand attaineth to do by thy strength, that do; for there is no work, nor device, nor knowledge, nor wisdom, in the grave, whither thou goest.
Read halakhic rulings (Jewish law) on Ecclesiastes 9:10: and classical halakhic sources.