Musannaf Ibn Abi Shaybah

Hazrat Sa’d narrates that we were with the Messenger of Allah, peace and blessings be upon him. He, peace and blessings be upon him, said: Is any one of you incapable of earning one thousand good deeds a day? So a questioner asked: How can any one of us earn a thousand good deeds? He, peace and blessings be upon him, said: He should say SubhanAllah (Glory be to Allah) one hundred times, and a thousand good deeds will be written for him or a thousand of his sins will be erased.