Quran 8:46 — The Spoils of War (Al-Anfal)

You shall obey GOD and His messenger, and do not dispute among yourselves, lest you fail and scatter your strength. You shall steadfastly persevere. GOD is with those who steadfastly persevere.

[8:45] O you who believe, when you encounter an army, you shall hold fast and commemorate GOD frequently, that you may succeed.

[8:47] Do not be like those who left their homes grudgingly, only to show off, and in fact discouraged others from following the path of GOD. GOD is fully aware of everything they do.