Messenger of Allah(ﷺ) said: "There is no soul that died bearing witness to La ilaha illallah, and that I am the Messenger of Allah, from the heart with certainity, but Allah will forgive it."
Sunan Ibn Majah Book 33, Hadith 140
← Previous Hadith his mother Su'da Al-Murriyyah said: "Umar bin Khattab passed by Talhah, after the Messenger of Allah(ﷺ) had died, and said: 'Why do you look so sad? Are you upset because your cousin has been appointed leader?' He said: 'No, but I heard the Messenger of Allah(ﷺ) say: "I know a word which no one says at the time of death but it will be light in his record of deeds, and his body and soul will find comfort in it at the time of death," -but I did not ask him about it before he died.' He ('Umar) said: ' I know what it is. It is what he wanted his uncle (Abu Talib) to say, and if he had known anything that would be more effective in saving him, he would have told him to say it.'"

Sunan Ibn Majah Book 33, Hadith 139 Next Hadith → "The Messenger of Allah(ﷺ) said: (About saying) La ilaha illah - no deed takes precedence over it and it does not leave any sin.'"

Sunan Ibn Majah Book 33, Hadith 141