Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that when the Prophet (peace and blessings be upon him) performed Tawaf of the House of Allah, he would touch (them), and in another narration, in every circuit he would perform Istilam of the Hajar (al-Aswad) and the Rukn (Yamani).