ENOfficial
It was narrated that Ibn 'Umar said: "The Messenger of Allah (ﷺ) said: There are two characteristics in which the Muslims are dependent upon their Mu'adh-dhins: their prayer and their fasting."
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُصَفَّى الْحِمْصِيُّ، حَدَّثَنَا بَقِيَّةُ، عَنْ مَرْوَانَ بْنِ سَالِمٍ، عَنْ عَبْدِ الْعَزِيزِ بْنِ أَبِي رَوَّادٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " خَصْلَتَانِ مُعَلَّقَتَانِ فِي أَعْنَاقِ الْمُؤَذِّنِينَ لِلْمُسْلِمِينَ صَلاَتُهُمْ وَصِيَامُهُمْ " .
sunnah.com