(80) باب مَا جَاءَ فِي السَّعْىِ بَيْنَ الصَّفَا وَالْمَرْوَةِ
Narrated `Asim:
I asked Anas bin Malik: "Did you use to dislike to perform Tawaf between Safa and Marwa?" He said, "Yes, as it was of the ceremonies of the days of the Pre-Islamic period of ignorance, till Allah revealed: 'Verily! (The two mountains) As-Safa and Al-Marwa are among the symbols of Allah. It is therefore no sin for him who performs the pilgrimage to the Ka`ba, or performs `Umra, to perform Tawaf between them.' " (2.158)
Reference: Sahih al-Bukhari 1648
In-book reference: Book 25, Hadith 129
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 26, Hadith 710