Hadith
Riyad as-Salihin #815
The Book of Du'a (Supplications)· كتاب الدعوات
riyad_as_salihin:815وعن أبي الدرداء رضي الله عنه أنه سمع رسول الله صلى الله عليه وسلم يقول: "ما من عبد مسلم يدعو لأخيه بظهر الغيب إلا قال الملك ولك بمثل" ((رواه مسلم)).
I heard the Messenger of Allah (ﷺ) saying, "Whenever a Muslim supplicates for his (Muslim) brother in his absence, the angels say: 'May the same be for you too'.".
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