Mishkat al-Masabih

Sa‘d b. Abu Waqqas said that along with the Prophet he once visited a woman in front of whom were some date-stones or pebbles which she was using as a rosary to glorify God. The Prophet suggested that he would tell her something which would be easier (or more excellent)* for her than that, and told her it consisted of saying, “Glory be to God as many times as the number of what He has created in the heaven; Glory be to God as many times as the number of what He has created in the earth; Glory be to God as many times as the number of what is between them; Glory be to God as many times as the number of what He is creating; God is most great (a similar number of times); Praise be to God (a similar number of times); There is no god but God (a similar number of times); There is no might and no power except in God (a similar number of times).” *The transmitter was not sure whether "easier" or "more excellent" was used. Tirmidhi and Abu Dawud transmitted it, Tirmidhi saying this is a gharib tradition.