Mishkat al-Masabih #621
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ عُثْمَانَ بْنِ أَبِي الْعَاصِ قَالَ قُلْتُ: يَا رَسُول الله اجْعَلنِي إِمَام قومِي فَقَالَ: «أَنْتَ إِمَامُهُمْ وَاقْتَدِ بِأَضْعَفِهِمْ وَاتَّخِذْ مُؤَذِّنًا لَا يَأْخُذُ عَلَى أَذَانِهِ أَجْرًا» . رَوَاهُ أَحْمَدُ وَأَبُو دَاوُد وَالنَّسَائِيّ
‘Uthman b. Abul ‘As said that he asked God's Messenger to make him his people’s imam and that he replied, “You are their imam, but do according to what the weakest of them is capable of, and employ a mu’adhdhin who does not accept payment for his adhan.”
Ahmad, Abu Dawud and Nasa'i transmitted it.
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About Mishkat al-Masabih
This hadith is #621 from Mishkat al-Masabih, in the Book of Prayer.