مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2108
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn 'Abbas (رضي الله عنه) said: The Messenger of Allah (ﷺ) was sent - or the Qur'an was revealed to him - when he was forty years old, and he remained in Makkah for thirteen years and in Madinah for ten years. He said: And the Messenger of Allah (ﷺ) died when he was sixty-three years old.
Musnad Ahmad 2110Its isnad is saheeh]