Musnad Abu Ya'la al-Mawsili 4:13

Musa ibn Hayyan al-Basri narrated to us, Abu Zayd al-Harashi narrated to us, Shu'bah narrated to us, from Isma'il, who said: I heard al-Sha'bi, from a man, from Sa'da, the wife of Talha ibn Ubayd Allah, from Talha, that he said: I heard a word from the Messenger of Allah (may Allah bless him and grant him peace) which I did not ask him about until he died or was taken. He said: "I surely know a word; no man says it at the time of his death except that it is a light for him in his record, and his soul and his body find rest for it at the time of death." Umar said: "I surely know it. It is the word he wanted from his uncle; I do not see it as anything other than it."