Musnad Ahmad 30:3838

Muhammad ibn Mus'ab narrated to us, al-Awza'i narrated to us, from al-Zuhri, from Abu Salamah, from Abu Hurairah: That the Messenger of Allah, peace and blessings of Allah be upon him, when he intended to depart from Mina, said: "We are staying tomorrow, if Allah the Exalted wills, at al-Muhassab, in the Khif of Banu Kinanah, where they swore an oath upon disbelief." And that is because the Quraish swore an oath against Banu Hashim and Banu al-Muttalib: that they would not intermarry with them, nor associate with them, until they handed over the Messenger of Allah, peace and blessings of Allah be upon him, to them.