﴿ أَثُمَّ إِذَا مَا وَقَعَ ءَامَنتُم بِهِۦٓ ۚ ءَآلْـَٰٔنَ وَقَدْ كُنتُم بِهِۦ تَسْتَعْجِلُونَ ﴾

“Will you, then, believe in it [only] after it has come to pass -[on the Day when you will be asked, `Do you believe in it] now, after having [contemptuously] called for its speedy advent?'”

Please check ayah 10:52 for complete tafsir.