881. hadíth
وَقَالَ رَسُولُ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ: «مَنْ أَذَّنَ فِي مِصْرٍ مِنْ أَمْصَارِ اَلْمُسْلِمِينَ سَنَةً وَجَبَتْ لَهُ اَلْجَنَّةُ.
The Messenger, and his family, said: "Whoever calls the adhan (call to prayer) in one of the cities of the Muslims for a year, Paradise becomes obligatory for him."