Musannaf Ibn Abi Shaybah 8934 — The reward of sending blessings

Sayyiduna Abu Talhah (may Allah be pleased with him) said: Once the Prophet (peace and blessings be upon him) came to us, and signs of joy were evident on his blessed face. We said: "O Messenger of Allah, today we see signs of joy on your blessed face; has something special happened?" He said: "The angel came to me and said: 'O Muhammad, your Lord says: Are you not pleased that if anyone of your Ummah sends blessings upon you once, I will send down mercy upon him ten times, and whoever sends salam upon you once, I will send peace upon him ten times?'" the Prophet (peace and blessings be upon him) said: "Why would I not be pleased with that?"