Sunan an-Nasa'i, Volume 3, Book 24, Hadith 2970 (DarusSalam) ⓘ

It was narrated that Urwah said: "I recited to Aishah: 'So it is not a sin on him who performs Hajj or Umrah (Pilgrimage) of the House to Perform the going Tawaf) between them (as-Safa and Al-Marwah) "I said: 'I do not care if I do not go between tham?' She said: 'What a bad thing you have said!' People at the time of the Jahiliyyah used not to go between them, but when Islam came and the Quran was revealed: 'Verily, As-Safa and Al-Marwah are of the symols of Allah, the Messenger of Allah went between them, and we did that with him, and thus it became part of Hajj.'"

أَخْبَرَنَا مُحَمَّدُ بْنُ مَنْصُورٍ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنِ الزُّهْرِيِّ، عَنْ عُرْوَةَ، قَالَ قَرَأْتُ عَلَى عَائِشَةَ ‏{‏ فَلاَ جُنَاحَ عَلَيْهِ أَنْ يَطَّوَّفَ بِهِمَا ‏}‏ قُلْتُ مَا أُبَالِي أَنْ لاَ أَطُوفَ بَيْنَهُمَا ‏.‏ فَقَالَتْ بِئْسَمَا قُلْتَ إِنَّمَا كَانَ نَاسٌ مِنْ أَهْلِ الْجَاهِلِيَّةِ لاَ يَطُوفُونَ بَيْنَهُمَا فَلَمَّا كَانَ الإِسْلاَمُ وَنَزَلَ الْقُرْآنُ ‏{‏ إِنَّ الصَّفَا وَالْمَرْوَةَ مِنْ شَعَائِرِ اللَّهِ ‏}‏ الآيَةَ فَطَافَ رَسُولُ اللَّهِ صلى الله عليه وسلم وَطُفْنَا مَعَهُ فَكَانَتْ سُنَّةً ‏.‏