Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
tabarani:9149 – [Chain 1] ʿUthmān b. ʿUmar al-Ḍabbī > Abū ʿUmar Ḥafṣ b. ʿUmar al-Ḥawḍī [Chain 2] Muḥammad b. Muḥammad al-Tammār > Muḥammad b. Kathīr > Shuʿbah > Abū Isḥāq > ʿAbd al-Raḥman > ʿAbdullāh

[Machine] He used to mix the two recitations from his Quran and say, "Didn't they mix in it what is not in it?"  

الطبراني:٩١٤٩ – حَدَّثَنَا عُثْمَانُ بْنُ عُمَرَ الضَّبِّيُّ ثنا أَبُو عُمَرَ حَفْصُ بْنُ عُمَرَ الْحَوْضِيُّ ح وَحَدَّثَنَا مُحَمَّدُ بْنُ مُحَمَّدٍ التَّمَّارُ ثنا مُحَمَّدُ بْنُ كَثِيرٍ قَالَا ثنا شُعْبَةُ عَنْ أَبِي إِسْحَاقَ عَنْ عَبْدِ الرَّحْمَنِ عَنْ عَبْدِ اللهِ

أَنَّهُ كَانَ يَحُكُّ الْمُعَوِّذَتَيْنِ مِنْ مُصْحَفِهِ فَيَقُولُ «أَلَا خَلَطُوا فِيهِ مَا لَيْسَ فِيهِ»  

See similar narrations below:

Collected by Ṭabarānī
tabarani:9150 – al-Ḥusayn b. Isḥāq al-Tustarī > ʿAlī b. al-Ḥusayn b. Ishkāb > Muḥammad b. Abū ʿUbaydah b. Maʿn from his father > al-Aʿmash > Abū Isḥāq > ʿAbd al-Raḥman b. Yazīd > ʿAbdullāh

[Machine] That he used to recite the two Mu'awwidhatayn (Surah Al-Falaq and Surah An-Nas) from the Quran, saying "They are not from the Book of Allah."  

الطبراني:٩١٥٠ – حَدَّثَنَا الْحُسَيْنُ بْنُ إِسْحَاقَ التُّسْتَرِيُّ ثنا عَلِيُّ بْنُ الْحُسَيْنِ بْنِ إِشْكَابَ ثنا مُحَمَّدُ بْنُ أَبِي عُبَيْدَةَ بْنِ مَعْنٍ عَنْ أَبِيهِ عَنِ الْأَعْمَشِ عَنْ أَبِي إِسْحَاقَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ يَزِيدَ عَنْ عَبْدِ اللهِ

أَنَّهُ كَانَ يَحُكُّ الْمُعَوِّذَتَيْنِ مِنَ الْمُصْحَفِ يَقُولُ «لَيْسَتَا مِنْ كِتَابِ اللهِ»