Is the dying person required to be asked to repent from disbelief (kufr), polytheism (shirk), and showing off (riya') before being prompted with the Shahadah, or is it sufficient to prompt him with the Shahadah only, and what is the correct way to do so in the Qur'an and Sunnah?

It is sunnah to prompt the dying person with "La ilaha illa Allah" (There is no god but Allah) so that these may be their last words, based on prophetic traditions. However, this does not absolve the dying person from repenting of their sins. If they do not repent, they may enter Hellfire, despite uttering the Shahada. Therefore, it is desirable to invite the sick and dying to repentance, if they are in a state where they can benefit from it, and without bothering or burdening them, but rather by encouraging them with the prospect of meeting Allah and emphasizing the aspect of hope. Jurists mention reminding the sick person to repent, and they limit themselves to prompting the dying person with the Shahada due to time constraints or because they may have been reminded previously. If there is ample time and the dying person is conscious, they should be reminded to repent, especially if they were known for shirk (polytheism) or bid'ah (innovation). However, if time is short, the focus should be on uttering the Shahada.