…Thus if they let you be and do not make war with you, and offer you peace, God does not allow you to harm them.* -- Q4:90
* Lit., “God has given you no way against them”: a reference to the ordinance laid down in verse 4: 86:- “But when you are greeted with a greeting [of peace], answer with an even better greeting, or [at least] with the like thereof. Verily, God keeps count indeed of all things.”
Prophet said
“There is no reward for him (who intends to fight in the way of God and seeks the value goods of this world)” – Fragment of a long Tradition quoted by Abu Daud on the authority of Abu Hurairah.