Al-A'raf 7:183

Those who reject Our Ayat, We shall gradually seize them with punishment in ways they perceive not (182)And I respite them; certainly My plan is strong.) Allah sai (183)

وَالَّذِينَ كَذَّبُوا بِآيَاتِنَا سَنَسْتَدْرِجُهُم مِّنْ حَيْثُ لَا يَعْلَمُونَ

(Those who reject Our Ayat, We shall gradually seize them in ways they perceive not) meaning, the doors of provisions will be opened for them and also the means of livelihood, in this life. They will be deceived by all this and think that they are on the correct path. Allah said in another instance,

فَلَمَّا نَسُوا مَا ذُكِّرُوا بِهِ فَتَحْنَا عَلَيْهِمْ أَبْوَابَ كُلِّ شَيْءٍ حَتَّىٰ إِذَا فَرِحُوا بِمَا أُوتُوا أَخَذْنَاهُم بَغْتَةً فَإِذَا هُم مُّبْلِسُونَ - فَقُطِعَ دَابِرُ الْقَوْمِ الَّذِينَ ظَلَمُوا وَالْحَمْدُ لِلَّهِ رَبِّ الْعَالَمِينَ

(So, when they forgot (the warning) with which they had been reminded, We opened for them the gates of every (pleasant) thing, until in the midst of their enjoyment in that which they were given, all of a sudden, We took them (in punishment), and lo! They were plunged into destruction with deep regrets and sorrow. So the root of the people who did wrong was cut off. And all the praises and thanks are to Allah, the Lord of all that exists.)[6:44-45]. Allah said here,

وَأُمْلِي لَهُمْ

(And I respite them) prolong what they are in,

إِنَّ كَيْدِي مَتِينٌ

(certainly My plan is strong) and perfect.