Fadl bin Abbas reported,

Usamah bin Zayd, who was riding behind the Messenger of Allah ﷺ, reported that on the evening of Arafah and on the morning of Muzdalifah, when the people were setting off, the Prophet ﷺ said to them, "Maintain calm," while he was reining in his she-camel.

Azami 5147

Sahih

عن الفضل بن عباس

- وكان رديف رسول الله ﷺ- أنه قال في عشية عرفة وغداة جمع للناس حين دفعوا: عليكم بالسكينة وهو كاف ناقته.

الأعظمي 5147صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Hajj
Chapter
Description of the Hajj of the Prophet ﷺ as narrated by Jabir and others, and the rulings mentioned therein
Section
Proceeding calmly when departing from Muzdalifa
Numbering
Jami al-Kamil 5147 (2nd edition)