It is narrated from Sayyiduna Abu Ayyub al-Ansari (may Allah be pleased with him); he said: The Messenger of Allah (peace and blessings be upon him) said to me: "O Abu Ayyub, shall I not teach you something?" I said: Certainly. He (peace and blessings be upon him) said: "When you reach the morning, say ten times: 'La ilaha illallahu wahdahu la sharika lah, lahul-mulku wa lahul-hamd, la sharika lah' (There is none worthy of worship except Allah alone, He has no partner; to Him belongs the dominion and to Him belongs all praise; He has no partner). No Muslim servant says it ten times but Allah records ten good deeds for him and erases ten evil deeds from him, and these words will be better with Allah on the Day of Resurrection than freeing ten slaves; and whoever says these words in the evening will receive a reward like that as well."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 4074