Hadith
Riyad as-Salihin #816
The Book of Du'a (Supplications)· كتاب الدعوات
riyad_as_salihin:816وعنه أن رسول الله صلى الله عليه وسلم كان يقول: "دعوة المرء المسلم لأخيه بظهر الغيب مستجابة، عند رأسه ملك موكل كلما دعا لأخيه بخير قال الملك الموكل به: آمين، ولك بمثل" ((رواه مسلم)).
The Messenger of Allah (ﷺ) said, "The supplication of a Muslim for his (Muslim) brother in his absence will certainly be answered. Everytime he makes a supplication for good for his brother, the angel appointed for this particular task says: 'A meen! May it be for you, too'.".
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