Surah 67. Al-Mulk, Ayah 28

I.e., "Whether we succeed in spreading God's message or not, what have you unbelievers to gain?"

 Meaning, whether Allah takes our lives (as you wish) or grants us a long life, it is all good for us. But who will protect you from Allah if you disbelieve in Him.

The sceptics might say and do say to the righteous: "Ah well! if calamities come, they involve the good with the bed, just as you say that Allah showers His mercies on both good and evil!" The answer is: "Don't you worry about us: even supposing we are destroyed, with all who believe with us, is that any consolation to you? Your sins must bring on you suffering, and nothing can ward it off. If we get any sorrows or sufferings, we take them as a mere trial to make us better, for we believe in Allah's goodness and we put our trust in Him." See next verse.