The Messenger of Allah ﷺ said, "Whoever says, 'There is no god but Allah alone, with no partner. To Him belongs the dominion, to Him belongs all praise, and He has power over all things,' ten times, it is for him equal to freeing a slave."
قال رسول الله ﷺ: من قال: لا إله إلا الله وحده لا شريك له، له الملك وله الحمد وهو على كل شيء قدير عشر مرات كن له عدل نسمة.
Nasai narrated it in Amal al-Yawm wal-Layla (125), and Ahmad (18518), and Ibn Hibban graded it sahih (850), all of them through the route of Talha bin Musarrif, from Abdul-Rahman bin Awsaja, from Bara bin Azib, who mentioned it. Its chain of transmission is sahih, and the hadith has other portions mentioned in their respective places.