{ So fight in the cause of Allah; you are not held accountable except for yourself; and urge the Believers on } Al-nisaa 84

The Most High is ordering His servant and His Messenger Muhammad (SAW) to engage in fighting by himself, and whoever shies away from him is of no concern to him. … { And urge the Believers on } : that is, to fight; and rouse in them the desire for it and encourage them in it, as He (SAW) said to them on the day of Badr, while putting the ranks in order: Rise up towards Jannah, as broad as the heavens and the earth! Many hadiths have been reported on this.