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:27178a –
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السيوطي:٢٧١٧٨a –

"يَا عُثْمَانُ: إِن الله ﷻ وقَدْ أبدَلَنَا بِالرَّهْبَانِيةِ الحَنِيفيِّةَ السَّمْحَةَ، وَالتَّكْبِيرَ عَلَى كُلِّ شَرَفٍ، فَإِنْ كُنْتَ مِنَّا فَاصنَعْ كمَا نَصْنَعُ".  

[طب] الطبرانى في الكبير عن أبى أمية الطائِفى عن جده سعيد بن العاص

See similar narrations below:

Collected by Ṭabarānī
tabarani:5519 – Aḥmad b. Dāwud al-Makkī > Ibrāhīm b. Zakariyyā

[Machine] "O Messenger of Allah, grant me permission for seclusion." He said to him, "O Uthman, indeed Allah has replaced us with the tolerant Hanafi monks and the proclamation of 'Allahu Akbar' on every honor. So if you are with us, then act as we act."  

الطبراني:٥٥١٩ – حَدَّثَنَا أَحْمَدُ بْنُ دَاوُدَ الْمَكِّيُّ ثنا إِبْرَاهِيمُ بْنُ زَكَرِيَّا ثنا أَبُو أُمَيَّةَ الطَّائِفِيُّ حَدَّثَنِي جَدِّي عَنْ جَدِّهِ سَعِيدِ بْنِ الْعَاصِ أَنَّ عُثْمَانَ بْنَ مَظْعُونٍ قَالَ

يَا رَسُولَ اللهِ ائْذَنْ لِي فِي الِاخْتِصَاءِ فَقَالَ لَهُ «يَا عُثْمَانُ إِنَّ اللهَ قَدْ أَبْدَلَنَا بِالرَّهْبَانِيَّةِ الْحَنَفِيَّةَ السَّمْحَةَ وَالتَّكْبِيرَ عَلَى كُلِّ شَرَفٍ فَإِنْ كُنْتَ مِنَّا فَاصْنَعْ كَمَا نَصْنَعُ»