Sahih Bukhari Volume 005, Book 058, Hadith Number 186.

Narated By 'Aisha : Allah caused the day of Buath to take place before Allah's Apostle was sent (as an Apostle) so that when Allah's Apostle reached Medina, those people had already divided (in different groups) and their chiefs had been killed or wounded. So Allah made that day precede Allah's Apostle so that they (i.e. the Ansar) might embrace Islam.

Narrated Ibn 'Abbas: 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."

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