כִּ֧י הַֽחַיִּ֛ים יוֹדְעִ֖ים שֶׁיָּמֻ֑תוּ וְהַמֵּתִ֞ים אֵינָ֧ם יוֹדְעִ֣ים מְא֗וּמָה וְאֵֽין־ע֤וֹד לָהֶם֙ שָׂכָ֔ר כִּ֥י נִשְׁכַּ֖ח זִכְרָֽם׃
For the living know that they shall die; but the dead know not any thing, neither have they any more a reward; for the memory of them is forgotten.
Read midrashic interpretation of Ecclesiastes 9:5: and classical rabbinic exegesis.