Zuhayr ibn Harb narrated to us, Abu Safwan al-Umawi narrated to us — and Abu al-Tahir and Harmalah ibn Yahya narrated to me, both saying: Ibn Wahb informed us — both of them from Yunus, from Ibn Shihab, from Ibn al-Musayyab, that he heard the Messenger of Allah, peace and blessings be upon him, say: "Swearing is an expenditure for the commodity and a wiping out of the profit."