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
bayhaqi:18231 – [Chain 1] Abū Ṭāhir al-Faqīh > Abū Ḥāmid b. Bilāl > Muḥammad b. Yaḥyá / al-Dhuhlī [Chain 2] Abū ʿAbdullāh al-Ḥāfiẓ > Abū al-Naḍr al-Faqīh > ʿUthmān b. Saʿīd al-Dārimī > Naṣr b. ʿAlī al-Jahḍamī from my father > Khālid b. Qays > Qatādah > Anas b. Mālik ؓ

[Machine] That the Messenger of Allah ﷺ wrote to Kisra and Caesar, and to every oppressive ruler, inviting them to Allah.  

البيهقي:١٨٢٣١ – أَخْبَرَنَا أَبُو طَاهِرٍ الْفَقِيهُ أنبأ أَبُو حَامِدِ بْنُ بِلَالٍ ثنا مُحَمَّدُ بْنُ يَحْيَى يَعْنِي الذُّهْلِيَّ ح وَأَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ أَخْبَرَنِي أَبُو النَّضْرِ الْفَقِيهُ ثنا عُثْمَانُ بْنُ سَعِيدٍ الدَّارِمِيُّ قَالَا ثنا نَصْرُ بْنُ عَلِيٍّ الْجَهْضَمِيُّ أَخْبَرَنِي أَبِي حَدَّثَنِي خَالِدُ بْنُ قَيْسٍ عَنْ قَتَادَةَ عَنْ أَنَسِ بْنِ مَالِكٍ ؓ

أَنَّ رَسُولَ اللهِ ﷺ كَتَبَ إِلَى كِسْرَى وَقَيْصَرَ وَإِلَى كُلِّ جَبَّارٍ يَدْعُوهُمْ إِلَى اللهِ ﷻ  

رَوَاهُ مُسْلِمٌ فِي الصَّحِيحِ عَنْ نَصْرِ بْنِ عَلِيٍّ الْجَهْضَمِيِّ