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suyuti:13700a
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السيوطي:١٣٧٠٠a

"خَصْلَتَانِ مُعَلَّقَتَانِ في أَعْناق الْمُؤَذِّنِينَ لِلْمُسْلِمِينَ: صِيَامُهُمْ وَصَلاتُهُمْ".  

[هـ] ابن ماجة [حل] أبى نعيم في الحلية عن ابن عمر

See similar narrations below:

Collected by Ibn Mājah
ibnmajah:712Muḥammad b. al-Muṣaffá al-Ḥimṣī > Baqiyyah > Marwān b. Sālim > ʿAbd al-ʿAzīz b. Abū Rawwād > Nāfiʿ > Ibn ʿUmar

"The Messenger of Allah said: There are two characteristics in which the Muslims are dependent upon their Mu'adh-dhins: their prayer and their fasting."  

ابن ماجة:٧١٢حَدَّثَنَا 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 ﷺ خَصْلَتَانِ مُعَلَّقَتَانِ فِي أَعْنَاقِ الْمُؤَذِّنِينَ لِلْمُسْلِمِينَ صَلاَتُهُمْ وَصِيَامُهُمْ