What is an example of the Prophet Muhammad (peace be upon him) doing a favor to `Abdullah bin Ubai, and how did he reciprocate the gesture?
 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.")