Sahih Bukhari

Narrated Zirr bin Hubaish:I asked Ubai bin Ka`b, ""O Abu AlMundhir! Your brother, Ibn Mas`ud said so-and-so (i.e., the two Mu'awwidh-at do not belong to the Qur'an)."" Ubai said, ""I asked Allah's Messenger (ﷺ) about them, and he said, 'They have been revealed to me, and I have recited them (as a part of the Qur'an),"" So Ubai added, ""So we say as Allah's Messenger (ﷺ) has said