Musannaf Ibn Abi Shayba 17:1244

Al-Hasan ibn Musa narrated to us, he said: Hammad ibn Salamah narrated to us, from Abu Suhayl, from his father, from Ibn Abbas, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever says when he reaches the morning: 'There is no god but Allah alone, He has no partner, to Him belongs the dominion, and to Him belongs the praise, and He is capable of all things,' it is for him equivalent to the freeing of a slave from the children of Ishmael. And ten good deeds are written for him, and ten evil deeds are removed from him by it, and he is raised ten degrees by it, and he is in a sanctuary from Satan until he reaches the evening. And if he says it when he reaches the evening, it is the same until he reaches the morning."