Silsilat al-Ahadith al-Sahihah

Abdullah bin Abu Talhah narrates from his father that the Messenger of Allah (peace and blessings be upon him) came one day and signs of happiness and delight were visible on his face. The companions said: We feel happiness on your face, (what is the reason?) He (peace and blessings be upon him) said: "An angel came to me and said: O Muhammad! Would it please you that your Lord has said: Whoever from your ummah sends blessings upon you once, I will send ten mercies upon him, and whoever from your ummah prays for peace for you, I will send ten peaces upon him?" He (peace and blessings be upon him) said: Why not (that is, I am pleased)."