Majma al-Zawaid — Hadith 16933

Sayyiduna Abu Ayyub al-Ansari (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "There are ten phrases; whoever recites them after performing the prayer: 'La ilaha illallahu wahdahu la sharika lah, lahu al-mulku wa lahu al-hamdu, wa huwa 'ala kulli shay'in qadir' (There is no god except Allah Almighty, He alone is the only one worthy of worship, He has no partner; the dominion belongs to Him alone and praise belongs to Him alone, and He has power over all things)", the Prophet (peace and blessings be upon him) says: "then because of these words Allah Almighty records ten good deeds for him, and because of them He erases ten of that person's sins, and because of these words He raises that person ten ranks; these words are equal for that person to the reward of freeing ten slaves, and these words become a protection for that person from Satan until the evening; and whoever recites these words in the evening will receive the same reward until the morning."
Al-Tabarani recorded it, and its narrators are thiqat (trustworthy).