Umar passed by Talha after the death of the Messenger of Allah ﷺ and said, "Why do I see you so downcast? Has your cousin's rule troubled you?"Talha replied, "No, but I once heard the Messenger of Allah ﷺ say, 'I know a word which, if anyone says it at the moment of his death, will be a light for his record, and his body and soul will find comfort through it at death.' Yet I did not ask him about it before he passed away."Umar said, "I know it. It is the very word he wanted his uncle to say. Had he known of anything more saving for him than it, he would have commanded him to say it."
حدثنا هارون بن إسحق الهمداني حدثنا محمد بن عبد الوهاب عن مسعر عن إسمعيل بن أبي خالد عن الشعبي عن يحيى بن طلحة
مر عمر بطلحة بعد وفاة رسول الله ﷺ فقال ما لك كئيبا أساءتك إمرة ابن عمك قال لا ولكن سمعت رسول الله ﷺ يقول إني لأعلم كلمة لا يقولها أحد عند موته إلا كانت نورا لصحيفته وإن جسده وروحه ليجدان لها روحا عند الموت فلم أسأله حتى توفي قال أنا أعلمها هي التي أراد عمه عليها ولو علم أن شيئا أنجى له منها لأمره
[Sahih] Its takhrij, Nasai narrated it in his Kubra 6/271, hadith no. 10940, from Harun through him. It has corroborating narrations, including one narrated by Ahmad 1/161, and its isnad is sahih. Hakim graded it sahih according to the conditions of the two of them (Bukhari and Muslim) 1/350, and Dhahabi agreed with him.