It is narrated from Hazrat Abdullah bin Masood (may Allah be pleased with him) that he said: Whoever says these words ten times: "There is no god but Allah, He is alone, He has no partner, His is the kingdom and His is the praise, and He has power over all things," then it is equal for him to freeing four slaves. According to the narrator's opinion, he also said: from the descendants of Hazrat Ismail (peace be upon him).