Sahih Muslim , Book 4, Hadith 1775 (USC-MSA) ⓘ
'Uqba b. 'Amir reported: The Messenger of Allah said to me: There have been sent down to me verses the like of which had never been seen before. They are the Mu'awwadhatain.
وَحَدَّثَنِي مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا إِسْمَاعِيلُ، عَنْ قَيْسٍ، عَنْ عُقْبَةَ بْنِ عَامِرٍ، قَالَ قَالَ لِي رَسُولُ اللَّهِ صلى الله عليه وسلم " أُنْزِلَ - أَوْ أُنْزِلَتْ - عَلَىَّ آيَاتٌ لَمْ يُرَ مِثْلُهُنَّ قَطُّ الْمُعَوِّذَتَيْنِ " .
also referenced under: Book 6, Hadith 320 (In-Book) & Hadith 814 (Reference)