Sunan an-Nasa'i 1826
سنن النسائي#1826SahihIt was narrated that Abu Saeed said:"The Messenger of Allah said: 'Prompt your dying ones to say La ilaha illallah (there is none worthy of worship except Allah)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Muslim
In-book reference: 21:9