The Prophet ﷺ saw people hurrying with a funeral procession and said, "You must maintain calm and dignity."
حدثنا محمد بن عبيد بن عقيل حدثنا بشر بن ثابت حدثنا شعبة عن ليث عن أبي بردة
عن النبي ﷺ أنه رأى جنازة يسرعون بها قال لتكن عليكم السكينة
[Its chain of transmission is daif] Ahmad narrated it (4/403, 412) from the hadith of Shubah, through this route. Layth is Ibn Abu Salim, as stated in Musnad, and his status was mentioned earlier, hadith no. 208, and Busiri graded it daif.