’Umm ad-Dardā’ and Abu ad-Dardā’ (may Allah be pleased with them) reported that the Prophet (may Allah's peace and blessings be upon him) used to say: "The supplication of a Muslim for a fellow Muslim in his absence is answered. At his head, there is an entrusted angel. Whenever he invokes good for his brother, the entrusted angel says: Amen, and likewise to you."
GradingAuthentic
AttributionNarrated by Muslim