Hadithcore
Riyad as-Salihin, 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'." <b>[Muslim]</b>.

وعنه 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)‏‏)‏‏.‏

References1 variant
In-Book Reference
Book 16, Hadith 31
Sharh · explanationclick to expand
<b>Guidance from the Hadiths:</b><br> 1) It is recommended for a Muslim to supplicate for himself and for his Muslim brothers to obtain what is good in the worldly life and in the Hereafter.<br> 2) Supplication for others in their absence is one of the readily answered supplications.<br> 3) Supplication for other Muslims in their absence indicates the truthfulness of faith, the continuity of their mutual love, and guarding the right of brotherhood.
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