The Messenger of Allah ﷺ said, "The caller to prayer is forgiven to the extent of his voice's reach, and every moist and dry thing bears witness for him. The one who witnesses the prayer has twenty-five good deeds recorded for him, and his sins between the two prayers are wiped away."
حدثنا محمد بن جعفر قال حدثنا شعبة عن موسى بن أبي عثمان قال سمعت أبا يحيى قال سمعت
قال رسول الله ﷺ المؤذن يغفر له مد صوته ويشهد له كل رطب ويابس وشاهد الصلاة يكتب له خمس وعشرون حسنة ويكفر عنه ما بينهما