Musannaf Ibn Abi Shayba 7:85

Abu Mu'awiyah narrated to us, from al-A'mash, from Abdullah, from Abu Kurayb, who said: I was walking with Abdullah in the market of al-Rahaq, and he heard a man swearing, "Nay, and by Surat al-Baqarah." Abdullah said: "Know that upon him, for every verse in it, is an oath."