سنن النسائي

It was narrated that Abu Najih As-Sulami said: "I heard the Messenger of Allah (ﷺ) say: 'Whoever shoots an arrow in the cause of Allah and it hits the target, it will raise him one level in Paradise.' That day I shot sixteen arrows that hit their targets." He said: "And I heard the Messenger of Allah (ﷺ) say: 'Whoever shoots an arrow in the cause of Allah, it is equal to the reward of freeing a slave.'"