﴿ وَيَقُولُونَ مَتَىٰ هَٰذَا ٱلْفَتْحُ إِن كُنتُمْ صَٰدِقِينَ ﴾

“But they answer: “When will that final decision take place, if what you [believers] say is true?””

(And they say) i.e. Banu Khuzaymah and Banu Kinanah say: (When cometh this victory (of yours)) the conquest of Mecca (if ye are truthful) that it will be conquered? They asked this question to mock the believers.