Narrated Jabir bin `Abdullah: When it was the day (of the battle) of Badr, prisoners of war were brought including Al-Abbas who was undressed. The Prophet looked for a shirt for him. It was found that the shirt of `Abdullah bin Ubai would do, so the Prophet let him wear it. That was the reason why the Prophet took off and gave his own shirt to `Abdullah. (The narrator adds, He had done the Prophet some favor for which the Prophet liked to reward him. )