مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3494
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 when he was forty years old. He stayed in Makkah for thirteen years, receiving Revelation, then he was commanded to migrate, so he migrated (and stayed in Madinah) for ten years, then he died when he was sixty-three years old.
Musnad Ahmad 3517Its isnad is saheeh, al-Bukhari (3902)]