It was narrated that Shurahbil bin As-Simit said: “I said:
‘‘Amr bin ‘Abasah! Tell us a Hadith that you heard from the
Messenger of Allah صلی اللہ علیہ وآلہ وسلم without forgetting or omitting anything.’ He said: ‘I heard the Messenger of Allah صلی اللہ علیہ وآلہ وسلم say: Whoever shoots and arrow in the cause of Allah, and it reaches the enemy, whether it misses or hits, it will be as if he freed slave. Whoever frees a believing slave, that will be a ransom for him, limb by limb, from the Fire of Hell. Whoever develops a gray hair in the cause of Allah, it will be light for him on the Day of Resurrection.” (Sahih)