וְלֹ֤א יִשְׁכְּבוּ֙ אֶת־גִּבּוֹרִ֔ים נֹפְלִ֖ים מֵעֲרֵלִ֑ים אֲשֶׁ֣ר יָרְדֽוּ־שְׁא֣וֹל בִּכְלֵֽי־מִלְחַמְתָּם֩ וַיִּתְּנ֨וּ אֶת־חַרְבוֹתָ֜ם תַּ֣חַת רָאשֵׁיהֶ֗ם וַתְּהִ֤י עֲוֺֽנֹתָם֙ עַל־עַצְמוֹתָ֔ם כִּֽי־חִתִּ֥ית גִּבּוֹרִ֖ים בְּאֶ֥רֶץ חַיִּֽים׃
And they that are inferior to the uncircumcised shall not lie with the mighty that are gone down to the nether-world with their weapons of war, whose swords are laid under their heads, and whose iniquities are upon their bones; because the terror of the mighty was in the land of the living.
Shulchan Arukh, Orach Chayim
25. All that eat and drink on Tisha B'av, will not see the joy of Jerusalem. And all that mourn on Jerusalem, will merit and see it in her joy. And that eat meat and drink at the Parting Meal, on him the verse says their iniquities are on their bones (Ezekiel 32:27).