Not graded
Hisn al-Muslim (Fortress of the Muslim) 153
((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.)
Cited in Hisn al-Muslim (Fortress of the Muslim) (No. 153).