فَلَمَّا رَأَوْهُ زُلْفَةً سِيٓـَٔتْ وُجُوهُ ٱلَّذِينَ كَفَرُوا۟ وَقِيلَ هَـٰذَا ٱلَّذِى كُنتُم بِهِۦ تَدَّعُونَ Qur’an Al-Mulk (67:27)Falamm a raawhu zulfatan seeat wujoohu alla th eena kafaroo waqeela h atha alla th ee kuntum bihi taddaAAoon a
Another possible translation: “This is what you were calling for.”
"It", i.e., the fulfilment of the promise, the Day of Judgment. When it is actually in sight, then the Unbelievers realise that those whom they used to laugh at for their Faith were in the right, and that they themselves, the sceptics, were terribly in the wrong.
They had defiantly asked for it. Now that it has come near, and it is too late for repentance, there is "weeping and gnashing of teeth".