What is required for the Islam of one who apostatized by denying an obligatory religious duty (Fard)?

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If one apostatized by denying an obligatory duty, their Islam is not established until they admit what they denied and repeat the two testimonies, because such a denial involves having lied against Allah and His Messenger through their belief. Similarly, if one denies a prophet, a verse of the Divine Book, one of the Divine Books, one of the angels whose angelic status is established, or permits something forbidden, their Islam necessitates admitting what they denied.