Musannaf Ibn Abi Shayba 22:289

Abu Khalid al-Ahmar narrated to us, from Ibn Sinan, from Abu al-Mubarak, from ‘Ata’, from Abu Sa’id, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "He has not believed in the Qur’an, the one who considers its prohibitions lawful."