Sahih Muslim Book - 15, Hadith - 3084

وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِى 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)

It was narrated that Anas said: “The Ansar did not like to go between As-Safa and Al-Marwah until Allah revealed: ‘Verily, As-Safa and Al-Marwah are of the Symbols of Allah. So it is not a sin on him who performs Hajj or Umrah of the House to perform the going (Tawaf) between them (As-Safa and Al-Marwah) … ’”