Sayyiduna Abu Umamah (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) said: "Whoever shoots an arrow in the path of Allah, whether it falls short or reaches the target, the reward of freeing a slave will be written for him."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7579