Musannaf Ibn Abi Shaybah 31118 — A man's supplication for an absent

Talhah said: Umm al-Darda said: "The supplication of a Muslim man made for his absent brother is never rejected." Talhah said: Umm al-Darda also said: "Beside the one supplicating there is an angel. Whenever he supplicates for good for his brother, the angel says: Amin, and may this supplication be accepted for you too."