Sahih al-Bukhari 4976
Sahih al-Bukhari · Book 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) · The Statement of Allah ta'ala: "Allāh-uṣ-Ṣamad (The Self-Sufficient Master, Whom all creatures need, He neither eats nor drinks) ." (V.112:2)
Narrated Zirr bin Hubaish:
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ ، حَدَّثَنَا سُفْيَانُ ، عَنْ عَاصِمٍ ، وَعَبْدَةَ ، عَنْ زِرِّ بْنِ حُبَيْشٍ ، قَالَ سَأَلْتُ أُبَىَّ بْنَ كَعْبٍ عَنِ الْمُعَوِّذَتَيْنِ، فَقَالَ سَأَلْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم فَقَالَ قِيلَ لِي فَقُلْتُ فَنَحْنُ نَقُولُ كَمَا قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم .
I asked Ubai bin Ka`b regarding the two Muwwidhat (Surats of taking refuge with Allah). He said, "I asked the Prophet (ﷺ) about them, He said, 'These two Surats have been recited to me and I have recited them (and are present in the Qur'an).' So, we say as Allah's Messenger (ﷺ) said (i.e., they are part of the Qur'an."