Sunan Abi Dawud

Narrated Sa'd ibn AbuWaqqas: Once Sa'd, with the Messenger of Allah (ﷺ), visited a woman in front of whom were some date-stones or pebbles which she was using as a rosary to glorify Allah. He (the Prophet) said: I tell you something which would be easier (or more excellent) for you than that. He said (it consisted of saying): ""Glory be to Allah"" as many times as the number of that which He has created in Heaven; ""Glory be to Allah"" as many times as the number of that which He has created on Earth; ""Glory be to Allah"" as many times as the number of that which He has created between them; ""Glory be to Allah"" as many times as the number of that which He is creating; ""Allah is most great"" a similar number of times; ""Praise (be to Allah)"" a similar number of times; and ""There is no god but Allah"" a similar number of times; ""There is no might and no power except in Allah"" a similar number of times