Abu Bakr ibn Abi Shaybah, Abu Kurayb, and Ishaq ibn Ibrahim narrated to us — and the wording is that of Ibn Abi Shaybah; Ishaq said: "We were informed," while the other two said: "Narrated to us" — Abu Usamah narrated to us, from al-Walid ibn Kathir, from Ma'bad ibn Ka'b ibn Malik, from Abu Qatadah al-Ansari, that he heard the Messenger of Allah, peace and blessings be upon him, say: "Beware of excessive swearing in selling, for it promotes the sale but then erases the blessing."