Sahih al-Bukhari 3847
Sahih al-Bukhari · Book 63: Merits of the Helpers in Madinah (Ansaar) · Al-Qasama in the Pre-Islamic Period of Ignorance
Narrated Ibn 'Abbas:
وَقَالَ ابْنُ وَهْبٍ أَخْبَرَنَا عَمْرٌو ، عَنْ بُكَيْرِ بْنِ الأَشَجِّ ، أَنَّ كُرَيْبًا ، مَوْلَى ابْنِ عَبَّاسٍ حَدَّثَهُ أَنَّ ابْنَ عَبَّاسٍ ـ رضى الله عنهما ـ قَالَ لَيْسَ السَّعْىُ بِبَطْنِ الْوَادِي بَيْنَ الصَّفَا وَالْمَرْوَةِ سُنَّةً، إِنَّمَا كَانَ أَهْلُ الْجَاهِلِيَّةِ يَسْعَوْنَهَا وَيَقُولُونَ لاَ نُجِيزُ الْبَطْحَاءَ إِلاَّ شَدًّا
To run along the valley between two green pillars of Safa and Marwa (mountains) was not Sunna, but the people in the pre-islamic period of ignorance used to run along it, and used to say: "We do not cross this rain stream except running strongly. "