"The Prophet said: 'Whoever calls the Adhan for seven years, seeking reward for it, salvation from the Fire is written for him.'"  

أَنَّ النَّبِيَّ ﷺ قَالَ مَنْ أَذَّنَ سَبْعَ سِنِينَ مُحْتَسِبًا كُتِبَتْ لَهُ بَرَاءَةٌ مِنَ النَّارِ