Zuhayr ibn Harb narrated to me, saying: Al-Walid ibn Muslim narrated to us, saying: Al-Awza'i narrated to me, saying: Al-Zuhri narrated to me, saying: Abu Salama narrated to me, saying: Abu Hurayra narrated to us, saying: The Messenger of Allah, peace and blessings be upon him, said to us while we were at Mina: "Tomorrow we shall encamp at Khayf of the Banu Kinana, where they swore an oath upon disbelief." That was because Quraysh and Banu Kinana had formed an alliance against Banu Hashim and Banu al-Muttalib that they would not intermarry with them nor trade with them until they handed over the Messenger of Allah, peace and blessings be upon him, to them. By that, he meant al-Muhassab.