Les Psaumes 94:23 Midrash : Seder Olam Rabbah & Midrash Tehillim

... Rabbi Yossi says, "A merit ends up being on a day of merit and a punishment ends up being on a day of punishment. For you will find to say that when the First Temple was destroyed, that day was the culmination of the Shabbat, and it was at the culmination of the sabbatical year and it was during the watch of Yehoyariv and it was the ninth of Av. And likewise with the Second. And in both this one and that one, the Levites were standing on the platform and reciting song. And what song did they recite? 'He will make their evil recoil upon them' (Psalms 94:23)."

And he inflicted their suffering upon them. Rabbi Isaac Luria (the Ari) said that on the day the Temple was destroyed, it was after Shabbat and after the fast of Tisha B'av, and Jehoiarib's watch was on duty both in the first and second Temple, and at that time the Levites were standing on their platform and reciting "He inflicted their suffering upon them." But they did not have time to complete the verse "May the Lord our God destroy them" before the enemies came and captured them.