Quran 9:39 — Ultimatum (Bara'ah)

Unless you mobilize, He will commit you to painful retribution and substitute other people in your place; you can never hurt Him in the least. GOD is Omnipotent.

[9:38] O you who believe, when you are told, "Mobilize in the cause of GOD," why do you become heavily attached to the ground? Have you chosen this worldly life in place of the Hereafter? The materials of this world, compared to the Hereafter, are nil.

[9:40] If you fail to support him (the messenger), GOD has already supported him. Thus, when the disbelievers chased him, and he was one of two in the cave, he said to his friend, "Do not worry; GOD is with us." GOD then sent down contentment and security upon him, and supported him with invisible soldiers. He made the word of the disbelievers lowly. GOD's word reigns supreme. GOD is Almighty, Most Wise.