Musnad Ahmad 1153:986

'Affan narrated to us, he said: Hammad narrated to us, he said: 'Abdullah ibn Abi Mulaykah informed us, he said: Al-Qasim ibn Muhammad narrated to me, from 'Aishah, that the Messenger of Allah (peace and blessings of Allah be upon him) recited this verse: "It is He who has sent down to you, [O Muhammad], the Book; in it are verses [that are] precise - they are the foundation of the Book - and others unspecific. As for those in whose hearts is deviation [from truth]..." [Al 'Imran: 7]. Until when he finished it, he said: "Allah, the Almighty and Majestic, has named them, so if you see them, then beware of them."