Sa’d bin Abee Waqqaas R.A said that we were with the Messenger of Allaah ﷺ and he said,
“Who is able to gain a Thousand good deeds each day?” Somebody then asked him, “How can a person gain a thousand good deeds?”
He replied, “He should say, “Subhan Allah” one hundred times, for a thousand goods deeds will be recorded for him and a thousand bad deeds wiped away.
( Sahee Muslim 2698/37).