Hadithcore
Mishkat al-Masabih, 688

Ibn ‘Umar reported God’s Messenger as saying, “Two characteristics are suspended on the necks of those who call the <i>adhan</i> for the Muslims, their fasting and their prayer.” Ibn Majah transmitted it.

وَعَنِ ابْنِ عُمَرَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ:

خَصْلَتَانِ مُعَلَّقَتَانِ فِي أَعْنَاقِ الْمُؤَذِّنِينَ لِلْمُسْلِمِينَ: صِيَامُهُمْ وَصَلَاتُهُمْ

. رَوَاهُ ابْنُ مَاجَه

References1 variant
In-Book Reference
Book 4, Hadith 120