It was narrated from Abu Ghaftan bin Tarif that he heard Ibn Abbas say: "When the Messenger of Allah departed he reined in his she-camel until its head touched the middle of his saddle, and he was saying to the people: “Be tranquil be tranquil,' on the evening of Arafat”"
SahihSahihIsnaad SahihBook 24 · Hadith 402