As he was dying, the Prophet (ﷺ) dipped his hands in water and wiped his face saying:
Lā ilāha illallāh
inna li ‘lmawti la’sakarāt.
There is none worthy of worship but Allah,
surely death has agonies.
Reference:
Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 8/144. The Hadith also mention him
using the Siivak (tooth stick).