The Messenger of Allah ﷺ said, "Whoever says ten times, 'There is no god but Allah alone, with no partner. To Him belongs the dominion and to Him belongs all praise. He gives life and causes death, and He is capable of all things,' it is equivalent for him to freeing four slaves from the descendants of Ismail."He said, this hadith has also been narrated from Abu Ayub as a mawquf report.
حدثنا موسى بن عبد الرحمن الكندي الكوفي حدثنا زيد بن حباب قال وأخبرني سفيان الثوري عن محمد بن عبد الرحمن بن أبي ليلى عن الشعبي عن عبد الرحمن بن أبي ليلى
قال رسول الله ﷺ من قال عشر مرات لا إله إلا الله وحده لا شريك له له الملك وله الحمد يحيي ويميت وهو على كل شيء قدير كانت له عدل أربع رقاب من ولد إسمعيل قال وقد روي هذا الحديث عن أبي أيوب موقوفا
Agreed upon by Bukhari and Muslim. Bukhari narrated it in "Supplications," chapter on the merit of saying, "There is no god but Allah," hadith no. 6404, from the hadith of Shaybi. Muslim narrated it, hadith no. 2693, from the hadith of Abdul-Rahman bin Abu Layla, with the same wording.