The truthful person is one compelled to a severe need of obeying the commandments (of Allaah); submitting to the (Sunnah of the) Messenger inwardly and outwardly and following him; worshiping Allaah through obedience to the Messenger in every act (of worship that involves) movement or without movement and with a sincere intention for the Sake of Allaah (The Mighty and Majestic).

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[Madaarij As-Saalikeen 3/295]