﴿ ٱسْتَجِيبُوا۟ لِرَبِّكُم مِّن قَبْلِ أَن يَأْتِىَ يَوْمٌۭ لَّا مَرَدَّ لَهُۥ مِنَ ٱللَّهِ ۚ مَا لَكُم مِّن مَّلْجَإٍۢ يَوْمَئِذٍۢ وَمَا لَكُم مِّن نَّكِيرٍۢ ﴾

“[Hence, O men,] respond to your Sustainer before there comes, at God’s behest, a Day on which there will be no turning back: [for] on that Day you will have no place of refuge, and neither will you be able to deny aught [of the wrong that you have done].”

Answer your Lord respond to Him by affirming His Oneness and worshipping Him before there comes a day namely the Day of Resurrection for which there is no revoking from God in other words one which when He brings about He will not revoke. On that day you will have no refuge in which to seek refuge in and for you there will be no way of denying your sins.