It is narrated from Sayyiduna Abu Burdah bin Niyar (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "No servant of my Ummah sends blessings upon me with sincerity of heart except that Allah sends ten mercies upon him in return, writes ten good deeds for him, raises him ten degrees, and erases ten of his bad deeds."
Hadith Referenceالمعجم الكبير للطبراني / باب الهاء / 18733