Narrated By Zirr bin Hubaish : I asked Ubai bin Ka'b regarding the two Muwwidhat (Surats of taking refuge with Allah). He said, "I asked the Prophet 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 Apostle said (i.e., they are part of the Qur'an"

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.‏

Narrated By 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 Apostle 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 Apostle has said."

حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُفْيَانُ، حَدَّثَنَا عَبْدَةُ بْنُ أَبِي لُبَابَةَ، عَنْ زِرِّ بْنِ حُبَيْشٍ، وَحَدَّثَنَا عَاصِمٌ، عَنْ زِرٍّ، قَالَ سَأَلْتُ أُبَىَّ بْنَ كَعْبٍ قُلْتُ يَا أَبَا الْمُنْذِرِ إِنَّ أَخَاكَ ابْنَ مَسْعُودٍ يَقُولُ كَذَا وَكَذَا‏.‏ فَقَالَ أُبَىٌّ سَأَلْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم فَقَالَ لِي قِيلَ لِي‏.‏ فَقُلْتُ، قَالَ فَنَحْنُ نَقُولُ كَمَا قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم‏.‏