قُل لَّكُم مِّيعَادُ يَوْمٍ لَّا تَسْتَـْٔخِرُونَ عَنْهُ سَاعَةً وَلَا تَسْتَقْدِمُونَ Qur’an Saba (34:30)Qul lakum meeAA a du yawmin l a tastakhiroona AAanhu s a AAatan wal a tastaqdimoon a
For my rendering of sa'ah (lit., "hour") as "a single moment", see surah {7}, note [26].
When that Day actually arrives, your period of probation will have passed. It will be too late. Now is the time for action.