It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Whoever says "Subhan Allah wa bihamdihi" one hundred times in the morning and evening, no one will come on the Day of Resurrection with a deed superior to his except someone who has said these words as many times or more than this.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 8835