Riyad as-Saliheen 1495
Abud-Darda' (May Allah be pleased with him) reported:
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'."
[Muslim].
وعنه أن رسول الله ﷺ 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)).
Classification
Sahih (Authentic)
References
Riyad as-Saliheen 1495
Riyad as-Saliheen Book of Du'a (Supplications), Hadith 31