﴿ وَيَسْتَعْجِلُونَكَ بِٱلْعَذَابِ وَلَن يُخْلِفَ ٱللَّهُ وَعْدَهُۥ ۚ وَإِنَّ يَوْمًا عِندَ رَبِّكَ كَأَلْفِ سَنَةٍۢ مِّمَّا تَعُدُّونَ ﴾

“And [so, O Muhammad,] they challenge thee to hasten the coming upon them of [God’s] chastisement: but God never fails to fulfill His promise - and, behold, in thy Sustainer’s sight a day is like a thousand years of your reckoning.”

Please check ayah 22:48 for complete tafsir.