《孔子家语·郊问》
郊祭的日子，有丧事的人家不能哭，穿丧服的人不能入国，郊外的道路都要打扫干净，行人禁止通行。
郊之日，丧者不敢哭，凶服者不敢入国门，汜扫清路，行者必止。
On the day of suburban sacrifices, people in mourning cannot cry, and people in mourning clothes cannot enter the country. The roads outside the suburbs should be cleaned and no pedestrians are allowed to pass.