Tafsir of Yunus 10:48

The Deniers of the Day of Resurrection wish to hasten its Coming and their Response Allah tells;

ويقولون متى هذا الوعد إن كنتم صادقين

And they say: "When will be this promise (the torment or the Day of Resurrection), if you speak the truth'' Allah told us about the idolators who reject faith through their demand that the punishment be hastened, inquiring about the time of punishment. The response to such question is not inherently beneficial, yet they inquired anyway. Allah said:

يستعجل بها الذين ﻻ يومنون بها والذين ءامنوا مشفقون منها ويعلمون أنها الحق

Those who believe not therein seek to hasten it, while those who believe are fearful of it, and know that it is the very truth. (42:18) They know that it is the truth for it is definitely going to happen. It is going to take place even if they have no idea when it will occur. This is why Allah instructed His Messenger to answer them saying: