Our Salaf: Umar Ibnul Khattaab–The best of deeds is the fulfilment of….
Umar Ibnul Khattaab (radiyallaahu-anhu) said:
The best of deeds is the fulfillment of what Allaah has made obligatory, refraining from what Allaah has forbidden out of fear of Him and having a truthful intention in (hoping) for what Allaah has with Him (of reward in the hereafter).
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[Jaami-ul Uloom Wal-Hikam:page:379]