It wasnarrated that Abu Sa'eed Al-Khudri said:
"The Messenger ofAllah(ﷺ) said: 'Urge your dying ones to say: "La ilaha illallah." (DE)
English reference (DE): Vol. 1, Book 6, Hadith 1445 (DE)
Arabic reference (DE): Book 6, Hadith 1512 (DE)