It was narrated that Usamah bin Zaid said: "I said: '0 Messenger of Allah, where will you stay tomorrow?' That was during his Hajj. He said: 'Has 'Aqil left us any house?' Then he said: 'Tomorrow we will stay in the valley of Banu Kinanah, Muhassab where the Quraish
swore an oath of disbelief.''' That was where Banu Kinanah had sworn an oath with the Quraish against Banu Hashim, that they would not intermarry with them or engage in trade with them. Ma'mar said: "Zuhri said: Khaif means a valley.''' (Sahih)