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
suyuti:22828a –
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السيوطي:٢٢٨٢٨a –

"مَنْ قَرَأَ {قُلْ هُوَ اللَّهُ أَحَدٌ} مِائَةَ مَرَّة فِي الصَّلاةِ أَوْ غَيرِهَا كَتَبَ اللهُ لَهُ بَرَاءَةً مِنَ النَّارِ".  

[طب] الطبرانى في الكبير والبغوى عن فيروز بن الديلمي

See similar narrations below:

Collected by Ṭabarānī
tabarani:16003 – Aḥmad b. Muḥammad al-Bazzāz al-Aṣbahānī > Muḥammad b. Qudāmah al-Jawharī > al-Muḥāribī > Abū Rajāʾ Muḥriz b. ʿAbdullāh > Ṣadaqah > ʿUrwah b. Rūwaym

[Machine] Narrated by Ibn Ad-Dailami, who is the son of the niece of An-Najashi and who served the Prophet ﷺ, he said: The Messenger of Allah ﷺ said, "Whoever recites the Surah Al-Ikhlas (Qul Huwa Allahu Ahad) one hundred times in prayer or outside of it, Allah will write for him a protective immunity from the Fire."  

الطبراني:١٦٠٠٣ – حَدَّثَنَا أَحْمَدُ بْنُ مُحَمَّدٍ الْبَزَّازُ الْأَصْبَهَانِيُّ ثَنَا مُحَمَّدُ بْنُ قُدَامَةَ الْجَوْهَرِيُّ ثَنَا الْمُحَارِبِيُّ عَنْ أَبِي رَجَاءٍ مُحْرِزِ بْنِ عَبْدِ اللهِ عَنْ صَدَقَةَ عَنْ عُرْوَةَ بْنِ رُوَيْمٍ

عَنْ ابْنِ الدَّيْلَمِيِّ وَهُوَ ابْنُ أُخْتِ النَّجَاشِيِّ وَقَدْ خَدَمَ النَّبِيَّ ﷺ قَالَ قَالَ رَسُولُ اللهِ ﷺ مَنْ قَرَأَ قُلْ هُوَ اللهُ أَحَدٌ مِائَةَ مَرَّةٍ فِي الصَّلَاةِ أَو غَيْرِهَا كَتَبَ اللهُ لَهُ بَرَاءَةً مِنَ النَّارِ