Sunan Ibn Majah, Volume 4, Book 24, Hadith 2812 (DarusSalam) ⓘ
It was narrated that ‘Amr bin ‘Abasah said: “I heard the Messenger of Allah say: ‘Whoever shoots an arrow at the enemy and his arrow reaches the enemy, whether it hits him or not, that is equivalent to him freeing a slave.’”
حَدَّثَنَا يُونُسُ بْنُ عَبْدِ الأَعْلَى، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، أَخْبَرَنِي عَمْرُو بْنُ الْحَارِثِ، عَنْ سُلَيْمَانَ بْنِ عَبْدِ الرَّحْمَنِ، عَنِ الْقَاسِمِ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ عَمْرِو بْنِ عَبَسَةَ، قَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " مَنْ رَمَى الْعَدُوَّ بِسَهْمٍ فَبَلَغَ سَهْمُهُ الْعَدُوَّ أَصَابَ أَوْ أَخْطَأَ فَيَعْدِلُ رَقَبَةً " .
also referenced under: Hadith 2812 (Reference) & Book 24, Hadith 2919 (In-Book)