Hadith
أَخْبَرَنَا مُحَمَّدُ بْنُ عَلِيِّ بْنِ حَرْبٍ، قَالَ حَدَّثَنَا مُحْرِزُ بْنُ الْوَضَّاحِ، عَنْ إِسْمَاعِيلَ، - يَعْنِي ابْنَ أُمَيَّةَ - عَنْ أَبِي غَطَفَانَ بْنِ طَرِيفٍ، حَدَّثَهُ أَنَّهُ، سَمِعَ ابْنَ عَبَّاسٍ، يَقُولُ لَمَّا دَفَعَ رَسُولُ اللَّهِ صلى الله عليه وسلم شَنَقَ نَاقَتَهُ حَتَّى أَنَّ رَأْسَهَا لَيَمَسُّ وَاسِطَةَ رَحْلِهِ وَهُوَ يَقُولُ لِلنَّاسِ " السَّكِينَةَ السَّكِينَةَ " . عَشِيَّةَ عَرَفَةَ .
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
Sahih · Abu Ghuddah
Sunan an-Nasa'i 3019 ·Book 24, Hadith 402·Also available on sunnah.com·