In The Name of Allaah, The Most Merciful, The Bestower of Mercy
Shaikh Rabee Bin Haadi [hafidhahullaah] said:
Indeed, a believer may hide some of his deeds, whilst his inner self is more upright [i.e. the righteousness in his heart etc] than his outward deeds [i.e. the righteous deeds he or she does openly etc]
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Source: Marhaban Yaa Taalibal Ilm’  page 223