Musannaf Ibn Abi Shaybah 31457 — Book of the Remembrance of Allah

Sayyiduna al-Bara bin Azib (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: Whoever recites these words ten times: None is worthy of worship but Allah, He is alone, He has no partner, His is the dominion and His is the praise, and He has power over all things, these words will be for him equal to freeing one soul (a slave).