The Messenger of Allah ﷺ said, "Whoever says, 'There is no god but Allah, alone with no partner. To Him belongs all sovereignty and all praise, and He has power over everything,' ten times when he rises in the morning, one hundred good deeds are recorded for him, one hundred sins are wiped away from him, he has the reward equal to freeing a slave, and he is protected that day until evening. Whoever says the same in the evening receives the same reward."
قال رسول الله ﷺ: من قال: لا إله إلا الله، وحده لا شريك له، له الملك، وله الحمد، وهو على كل شيء قدير، من قالها عشر مرات حين يصبح، كتب له بها مائة حسنة، ومحي عنه بها مائة سيئة، وكانت له عدل رقبة، وحفظ بها يومئذ حتى يمسي، ومن قال مثل ذلك حين يمسي، كان له مثل ذلك.
Ahmad (2719) and Nasai in Amal al-Yawm wal-Layla (26) both narrated it through the hadith of Makki bin Ibrahim, who said, Abdullah bin Saeed told us, from Sumayy, from Abu Salih, from Abu Hurairah, and he mentioned it. Its isnad is hasan because of Abdullah bin Saeed, who is Ibn Abu Hind of Madinah. Haythami said in Majma (10/113), "Ahmad narrated it, and its narrators are the narrators of the Sahih."