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
hakim:850 – Abū Muḥammad ʿAbdullāh b. Isḥāq al-ʿAdl> Ibrāhīm b. Isḥāq b. al-Sirāj > ʿUqbah b. Mukram al-Ḍabbī > Yūnus b. Bukayr > Misʿar > Muḥammad b. Qays > Abū Hurayrah

[Machine] The Messenger of Allah ﷺ used to say "In the name of Allah, the Most Gracious, the Most Merciful" out loud. Muhammad is weak, meaning Muhammad ibn Qais.  

الحاكم:٨٥٠ – مَا حَدَّثَنَا أَبُو مُحَمَّدٍ عَبْدُ اللَّهِ بْنُ إِسْحَاقَ الْعَدْلُ بِبَغْدَادَ ثنا إِبْرَاهِيمُ بْنُ إِسْحَاقَ بْنِ السِّرَاجٍ ثنا عُقْبَةُ بْنُ مُكْرَمٍ الضَّبِّيُّ ثنا يُونُسُ بْنُ بُكَيْرٍ ثنا مِسْعَرٌ عَنْ مُحَمَّدِ بْنِ قَيْسٍ عَنْ أَبِي هُرَيْرَةَ قَالَ

كَانَ رَسُولُ اللَّهِ ﷺ «يَجْهَرُ بِبِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ» محمد ضعيف يعني محمد بن قيس  

See similar narrations below:

Collected by Suyūṭī
suyuti:4-450b – ʿAli
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السيوطي:٤-٤٥٠b –

"عن عَلِىٍّ قالَ: كان رَسولُ الله ﷺ يَجْهَرُ بِبِسْم الله الرَّحمنِ الرَّحيم في السُّورَتَيْن جَمِيعًا".  

[قط] الدارقطنى في السنن