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:20268a –
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السيوطي:٢٠٢٦٨a –

"مَنْ أَحْسَن مِنْكُم أَنْ يَتَكَلَّم بِالعَربِيَّة، فَلَا يَتَكَلَّمَنَّ بالفَارسِيَّةِ؛ فَإِنَّه يُورِثُ النِّفَاقَ".  

[ك] الحاكم في المستدرك عن ابن عمر وتُعُقِّب

See similar narrations below:

Collected by Ḥākim
hakim:7001 – Abū ʿAmr Saʿīd b. al-Qāsim b. al-ʿAlāʾ al-Muṭṭawwiʿī > Aḥmad b. al-Layth b. al-Khalīl > Isḥāq b. Ibrāhīm al-Jurayrī Bibalkh > ʿAmr b. Hārūn > Usāmah b. Zayd al-Laythī > Nāfiʿ > Ibn ʿUmar

[Machine] The Messenger of Allah ﷺ said, "Whoever among you is better in speech in Arabic, should not speak in Persian, for it only leads to hypocrisy." Among those who lied about this was Amr Ibn Haroon, as stated by Ibn Mu'een, and the majority of scholars abandoned him.  

الحاكم:٧٠٠١ – مَا حَدَّثَنِي أَبُو عَمْرٍو سَعِيدُ بْنُ الْقَاسِمِ بْنِ الْعَلَاءِ الْمُطَّوِّعِيُّ ثَنَا أَحْمَدُ بْنُ اللَّيْثِ بْنِ الْخَلِيلِ ثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ الْجُرَيْرِيُّ بِبَلْخٍ ثَنَا عَمْرُو بْنُ هَارُونَ ثَنَا أُسَامَةُ بْنُ زَيْدٍ اللَّيْثِيُّ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ «مَنْ أَحْسَنَ مِنْكُمْ أَنْ يَتَكَلَّمَ بِالْعَرَبِيَّةِ فَلَا يَتَكَلَّمَنَّ بِالْفَارِسِيَّةِ فَإِنَّهُ يُوَرِّثُ النِّفَاقَ» وَمِنْهَاعمرو بن هارون كذبه ابن معين وتركه الجماعة