عَنْ أَبِي مَحْذُورَةَ رضى الله عنه
«أَنَّ اَلنَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَلَّمَهُ اَلْآذَانَ، فَذَكَرَ فِيهِ اَلتَّرْجِيعَ»
The Prophet (sallallahu alayhi wa sallam) taught him the Adhan (call to prayer) and he (the narrator) mentioned the Tarji in it. [Muslim reported it, but mentioned the phrase (Takbir) “Allah is the Most Great” at its beginning just twice.