Al-Baqarah 2:158

۞إِنَّ ٱلصَّفَا وَٱلۡمَرۡوَةَ مِن شَعَآئِرِ ٱللَّهِۖ فَمَنۡ حَجَّ ٱلۡبَيۡتَ أَوِ ٱعۡتَمَرَ فَلَا جُنَاحَ عَلَيۡهِ أَن يَطَّوَّفَ بِهِمَاۚ وَمَن تَطَوَّعَ خَيۡرٗا فَإِنَّ ٱللَّهَ شَاكِرٌ عَلِيمٌ 158

Indeed, as-Safa and al-Marwah are among the symbols of Allah. So whoever makes Hajj to the House or performs 'umrah - there is no blame upon him for walking between them. And whoever volunteers good - then indeed, Allah is appreciative and Knowing