The Rites of Hajj (Kitab Al-Manasik Wa'l-Hajj)
Dawud :: Book 10 : Hadith 1889
Narrated Jubayr ibn Mut'im:
The Prophet (peace_be_upon_him) said: Do not prevent anyone from going round this House (the Ka'bah) and from praying any moment he desires by day or by night. The narrator Fadl (ibn Ya'qub) said: The Apostle of Allah (peace_be_upon_him) said: Banu Abdu Munaf, do not stop anyone.