مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2368
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that `Ata' bin Abi Rabah said: I heard Ibn 'Abbas (رضي الله عنه) say: The Messenger of Allah (ﷺ) died when I had just been circumcised.[1] [1]At that time, boys would be circumcised when they reached puberty.
Musnad Ahmad 2379A saheeh hadeeth]