Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates from Sayyiduna Abu Talhah (may Allah be pleased with him), who said: I came to the Messenger of Allah (peace and blessings be upon him) and his (peace and blessings be upon him) face was shining with joy. I said: O Messenger of Allah! You are in a state that I have never seen before. He (peace and blessings be upon him) said: "Why should I not be happy? Jibril (peace be upon him) came to me just now and said: 'Give glad tidings to your Ummah that whoever sends blessings upon you once, ten good deeds are recorded for him, ten of his sins are erased, he is raised ten degrees, Allah replies to him in the same way as his words, and it will be presented to him on the Day of Resurrection.'"
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 4704