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What to encourage the dying person to say

He will enter Paradise, he who dies with the last words saying
لا إلهَ إلاّ اللّه
 
Laa ‘ilaaha ‘illallaah
There is none worthy of worship but Allah.

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