He whose last words are:

لاَ إِلَهَ إِلاَّ اللَّهُ

There is none worthy of worship but Allah.

Laa 'ilaaha 'illallaahu.

...will enter Paradise.

Abu Dawud 3/190. See also Al-Albani, Sahihul-Jami' As-Saghir 5/432.