Say, "Indeed, I am on clear evidence from my Lord, and you have denied it. I do not have that for which you are impatient.1 The decision is only for Allāh. He relates the truth, and He is the best of deciders."
Translation: Saheeh International (English)
1 The disbelievers would challenge the Prophet (ﷺ), telling him to bring on Allāh's punishment if he should be truthful in his warning.
Say, O Messenger, to these idolaters: I stand on clear evidence from my Lord, not on vain desires, yet you have denied this evidence. I do not have the punishment and the extraordinary signs that you demand and that you are in such haste to bring about. That is only in Allah’s control. The decision for anything, including what you demand, is only Allah’s. He speaks the truth and decides accordingly. Allah, may He be glorified, is the best of those who decide between truth and falsehood.