It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Whoever recites these words ten times in the morning: "La ilaha illallah wahdahu la sharika lahu, lahul mulk wa lahul hamd wa huwa 'ala kulli shay'in qadeer" — it will be equal to freeing a slave, and a hundred good deeds will be written for him, a hundred sins will be erased, and it will be a means of protection from Satan until the evening. And whoever does this in the evening, the same ruling applies to him.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 8719