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.
suyuti:4-1286bIbn ʿBbās > Sʾlt ʿLá b. Abá Ṭālib Lim Lam Yuktb Fiá Brāʾh Bism Allāh al-Raḥman al-Raḥīm > Lʾn
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السيوطي:٤-١٢٨٦b

" عنْ ابنِ عبَّاس قالَ: سألتُ على بن أَبى طالِبٍ لِمَ لَمْ يُكْتبْ فِى براءةَ بِسْم اللهِ الرَّحمَنِ الرَّحِيم؟ قالَ: لأن بِسْم الله الرَّحْمَنِ الرَّحِيم أَمانٌ، وبراءة نَزَلتْ بالسيف".  

أبو الشيخ، وابن مردويه