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مَنْ كَانَ آخِرُ كَلاَمِهِ لاَ إِلَهَ إِلاَّ اللَّهُ دَخَلَ الْجَنَّةَ
i.e. those around the sick should instruct and encourage him to say the shahadah. (He whose last words are: (None has the right to be worshipped except Allah.) will enter Paradise.)
Source: Abu Dawud 3/190.