Musnad Ahmad 1153:342

Abu Nu'aym narrated to us, he said: Sufyan narrated to us, from Ubayd Allah ibn Abi Ziyad, he said: I heard al-Qasim say: Aisha said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The circumambulation (Tawaf) of the House, and (the walking) between al-Safa and al-Marwah, and the stoning of the Jamarat were only ordained for the establishment of the remembrance of Allah, the Almighty and Majestic."