مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2226
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn 'Abbas (رضي الله عنه) that he said: The people of Badr were three hundred and thirteen men, the Muhajireen were seventy six, and the defeat of the people of Badr was on Friday the seventeenth of Ramadan.
Musnad Ahmad 2232lts isnad is da'eef]