Chapter 57: One-fifth of Booty to the Cause of Allah (Khumus)
Narrated Ibn 'Umar: 'Uthman did not join the Badr battle because he was married to one of the daughters of Allah' s
Apostle and she was ill. So, the Prophet (ﷺ) said to him. "You will get a reward and a share (from the war
booty) similar to the reward and the share of one who has taken part in the Badr battle."
Sahih al-Bukhari 3130