Chapter 16: The Book of Pilgrimage
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.
Sahih Muslim 1278