Inciting the believers to war and reward for it

So, when you clash with the unbelievers, smite their necks until you overpower them, then hold them in bondage. Then either free them graciously or after taking a ransom, until war shall have come to end. If God had pleased He could have punished them (Himself), but He wills to test some of you through some others. He will not allow the deeds of those who are killed in the cause of God to go waste.

He will show them the way, and better their state,

And will admit them into gardens with which he has acquainted them.