Hadith 151

As he was dying, the Prophet (SAW) 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).

جعل النبي صلى الله عليه وسلم عند موته يدخل يديه في الماء فيمسح بهما وجههُ ويقول : لا إله إلا الله إن للموت لسكرات

Reference: 1521510
In-book reference: Book 1, Hadith 151