Quran 9:48 — Ultimatum (Bara'ah)

They sought to spread confusion among you in the past, and confounded the matters for you. However, the truth ultimately prevails, and GOD's plan is carried out, in spite of them.

[9:47] Had they mobilized with you, they would have created confusion, and would have caused disputes and divisions among you. Some of you were apt to listen to them. GOD is fully aware of the transgressors.

[9:49] Some of them would say, "Give me permission (to stay behind); do not impose such a hardship on me." In fact, they have thus incurred a terrible hardship; Hell is surrounding the disbelievers.