Sa'd (radhi-yAllaahu 'anhu) said: We were sitting with the Messenger of Allaah (sal-Allaahu 'alayhe wa sallam), and he said: Are any of you unable to gain a thousand good deeds each day? Somebody then asked him (sal-Allaahu 'alayhe wa sallam): How does one achieve a thousand good deeds? He replied: He should say:
سُبْحَانَ اللّٰهِ
How perfect Allaah is.
Subhaanallaahi.
...one hundred times, for a thousand good deeds are recorded for him or a thousand bad deeds are wiped away.