Sayyiduna al-Muttalib bin Abi Wada'ah al-Sahmi (may Allah be pleased with him) said: "I saw the Messenger of Allah (peace and blessings be upon him) praying in the Sacred Mosque (al-Masjid al-Haram) while the people were circling the House (in tawaf); they were passing in front of him, between him and the qiblah, and there was no barrier (sutrah) between him and them."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17813