minhagimWe're still mapping where this idea was first discussed. Key passages and related ideas below.
Sitting on Ground until Chatzot on Tisha B'Av
Sitting low to the ground until midday on Tisha B'Av — taking on a mourner's posture so the whole community grieves together.
On Tisha B'Av, the day mourning the destruction of the Temples, Jews sit low to the ground — on the floor or a low stool — until midday, taking on the posture of a personal mourner so the whole community grieves together.
Key passages(3)
Shulchan Arukh, Orach Chayim :: sitting-low-tisha-bav :: 555:2↗curated_attribution
Shulchan Arukh, Orach Chayim · Joseph Karo · 1563 CE
High
Kitzur Shulchan Arukh :: sitting-low-tisha-bav :: 124:5↗curated_attribution
Kitzur Shulchan Arukh · Shlomo Ganzfried · 1844 CE
High
Mishnah Berurah :: sitting-low-tisha-bav :: 555:6↗curated_attribution
Mishnah Berurah · Israel Meir Kagan (Chafetz Chaim) · 1875 CE
High