insincerity in faith

إِنَّ ٱلَّذِينَ يَشْتَرُونَ بِعَهْدِ ٱللَّهِ وَأَيْمَـٰنِهِمْ ثَمَنًا قَلِيلًا أُو۟لَـٰٓئِكَ لَا خَلَـٰقَ لَهُمْ فِى ٱلْـَٔاخِرَةِ وَلَا يُكَلِّمُهُمُ ٱللَّهُ وَلَا يَنظُرُ إِلَيْهِمْ يَوْمَ ٱلْقِيَـٰمَةِ وَلَا يُزَكِّيهِمْ وَلَهُمْ عَذَابٌ أَلِيمٌ

Indeed, those who exchange the covenant of Allāh and their [own] oaths for a small price will have no share in the Hereafter, and Allāh will not speak to them or look at them on the Day of Resurrection, nor will He purify them; and they will have a painful punishment.

وَمِنَ ٱلْأَعْرَابِ مَن يَتَّخِذُ مَا يُنفِقُ مَغْرَمًا وَيَتَرَبَّصُ بِكُمُ ٱلدَّوَآئِرَ ۚ عَلَيْهِمْ دَآئِرَةُ ٱلسَّوْءِ ۗ وَٱللَّهُ سَمِيعٌ عَلِيمٌ

And among the bedouins are some who consider what they spend as a loss and await for you turns of misfortune. Upon them will be a misfortune of evil. And Allāh is Hearing and Knowing.

سَيَقُولُ لَكَ ٱلْمُخَلَّفُونَ مِنَ ٱلْأَعْرَابِ شَغَلَتْنَآ أَمْوَٰلُنَا وَأَهْلُونَا فَٱسْتَغْفِرْ لَنَا ۚ يَقُولُونَ بِأَلْسِنَتِهِم مَّا لَيْسَ فِى قُلُوبِهِمْ ۚ قُلْ فَمَن يَمْلِكُ لَكُم مِّنَ ٱللَّهِ شَيْـًٔا إِنْ أَرَادَ بِكُمْ ضَرًّا أَوْ أَرَادَ بِكُمْ نَفْعًۢا ۚ بَلْ كَانَ ٱللَّهُ بِمَا تَعْمَلُونَ خَبِيرًۢا

Those who remained behind of the bedouins will say to you, "Our properties and our families occupied us, so ask forgiveness for us." They say with their tongues what is not within their hearts. Say, "Then who could prevent Allāh at all if He intended for you harm or intended for you benefit? Rather, ever is Allāh, of what you do, Aware.