Sahih (Sahih Muslim)
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، عَنْ عَاصِمٍ، عَنْ أَنَسٍ، قَالَ كَانَتِ الأَنْصَارُ يَكْرَهُونَ أَنْ يَطُوفُوا بَيْنَ الصَّفَا وَالْمَرْوَةِ حَتَّى نَزَلَتْ { إِنَّ الصَّفَا وَالْمَرْوَةَ مِنْ شَعَائِرِ اللَّهِ فَمَنْ حَجَّ الْبَيْتَ أَوِ اعْتَمَرَ فَلاَ جُنَاحَ عَلَيْهِ أَنْ يَطَّوَّفَ بِهِمَا}
Anas (Allah be pleased with him) reported that the Ansar felt reluctant that they should circumambulate between al-Safa' and al-Marwa until it was revealed:" Verily al-Safa' and al-Marwa are among the Signs of Allah" ; so whoever performs Hajj or 'Umra, for him there is no harm that he should circumambulate between them