Sahih Bukhari Volume 002, Book 026, Hadith Number 731.
Narated By Ibn Abbas.Â : I proceeded along with the Prophet on the day of 'Arafat (9th Dhul-Hijja). The Prophet heard a great hue and cry and the beating of camels behind him. So he beckoned to the people with his lash, "O people! Be quiet. Hastening is not a sign of righteousness."