"The Messenger of Allah said: 'Whoever calls the Adhan for seven years, seeking reward (from Allah), Allah will decree for him deliverance from the Fire.'" (Using translation from Ibn Mājah 727)
قَالَ رَسُولُ اللهِ ﷺ «مَنْ أَذَّنَ سَبْعَ سِنِيَنَ مُحْتَسِبًا كُتِبَ لَهُ بَرَاءَةٌ مِنَ النَّارِ»