مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2488
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn 'Abbas (رضي الله عنه) said: The conquest (of Makkah) occurred on the thirteenth of Ramadan.
Musnad Ahmad 2500Its isnad is hasan]