Quran 9:43 — Ultimatum (Bara'ah)

GOD has pardoned you: why did you give them permission (to stay behind), before you could distinguish those who are truthful from the liars?

[9:42] If there were a quick material gain, and a short journey, they would have followed you. But the striving is just too much for them. They will swear by GOD: "If we could, we would have mobilized with you." They thus hurt themselves, and GOD knows that they are liars.

[9:44] Those who truly believe in GOD and the Last Day do not ask your permission to evade the opportunity to strive with their money and their lives. GOD is fully aware of the righteous.