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:6108 – ʿAbdān b. Muḥammad al-Marwazī > Qutaybah b. Saʿīd > ʿAbd al-Karīm b. Muḥammad al-Jurjānī > Qays b. al-Rabīʿ > Abū Hāshim al-Rummānī > Zādhān > Salmān

[Machine] No one was more revered than the Messenger of Allah ﷺ , and his companions used to write to him by addressing the letter from so-and-so to Muhammad, the Messenger of Allah ﷺ .  

الطبراني:٦١٠٨ – حَدَّثَنَا عَبْدَانُ بْنُ مُحَمَّدٍ الْمَرْوَزِيُّ ثنا قُتَيْبَةُ بْنُ سَعِيدٍ حَدَّثَنِي عَبْدُ الْكَرِيمِ بْنُ مُحَمَّدٍ الْجُرْجَانِيُّ عَنْ قَيْسِ بْنِ الرَّبِيعِ عَنْ أَبِي هَاشِمٍ الرُّمَّانِيِّ عَنْ زَاذَانَ عَنْ سَلْمَانَ قَالَ

مَا كَانَ أَحَدٌ أَعْظَمَ حُرْمَةً مِنْ رَسُولِ اللهِ ﷺ وَكَانَ أَصْحَابُهُ إِذَا كَتَبُوا إِلَيْهِ كَتَبُوا مِنْ فُلَانٍ إِلَى مُحَمَّدٍ رَسُولِ اللهِ ﷺ  

See similar narrations below:

Collected by Bayhaqī
bayhaqi:20424 – Abū ʿAbdullāh al-Ḥāfiẓ And ʾAbū al-Ḥasan ʿAlī b. Aḥmad b. Ibrāhīm al-Khusrawjirdī > Abū Ḥāmid Aḥmad b. Muḥammad b. al-Ḥusayn al-Bayhaqī > Dāwud b. al-Ḥusayn > Qutaybah > ʿAbd al-Karīm b. Muḥammad > Qays > Abū Hāshim > Zādhān > Salmān

[Machine] No one had greater sanctity than the Messenger of Allah ﷺ . When the companions of the Messenger of Allah ﷺ wrote to him, they would write "From so-and-so to Muhammad, the Messenger of Allah ﷺ ."  

البيهقي:٢٠٤٢٤ – أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ وَأَبُو الْحَسَنِ عَلِيُّ بْنُ أَحْمَدَ بْنِ إِبْرَاهِيمَ الْخُسْرَوْجِرْدِيُّ قَالَا أنبأ أَبُو حَامِدٍ أَحْمَدُ بْنُ مُحَمَّدِ بْنِ الْحُسَيْنِ الْبَيْهَقِيُّ ثنا دَاوُدُ بْنُ الْحُسَيْنِ ثنا قُتَيْبَةُ ثنا عَبْدُ الْكَرِيمِ بْنُ مُحَمَّدٍ عَنْ قَيْسٍ عَنْ أَبِي هَاشِمٍ عَنْ زَاذَانَ عَنْ سَلْمَانَ ؓ قَالَ

لَمْ يَكُنْ أَحَدٌ أَعْظَمَ حُرْمَةً مِنْ رَسُولِ اللهِ ﷺ كَانَ أَصْحَابُ رَسُولِ اللهِ ﷺ إِذَا كَتَبُوا إِلَيْهِ يَكْتُبُونَ مِنْ فُلَانٍ إِلَى مُحَمَّدٍ رَسُولِ اللهِ ﷺ