Musannaf Ibn Abi Shaybah 37799 — Reports on the virtue of remembering

Sayyiduna Abu Ayyub al-Ansari (may Allah be pleased with him) narrates from the Prophet (peace and blessings be upon him) that he (peace and blessings be upon him) said: "Whoever says ten times: 'La ilaha illallahu wahdahu la sharika lah, lahul-mulku wa lahul-hamdu biyadihil-khayru wa huwa ala kulli shay'in qadir' (None has the right to be worshipped except Allah alone, He has no partner; His is the dominion and His is the praise, in His hand is all good, and He has power over all things), these will be equal to freeing ten slaves," or: "equal to freeing one slave."