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