Dhikr

The Holy Prophet (صلى الله عليه وسلم) has said that one who has been obeying Allah - that is, following the injunctions with regards to the Halal and Haram - has truly been remembering Allah, in spite of being deficient in (nafl: supererogatory) prayers and fasting, while one who has been disobeying divine commandments has, in fact, forgotten Allah, in spite of devoting long hours to nafl prayers