Why boasting is wrong

۞ وَٱعْبُدُوا۟ ٱللَّهَ وَلَا تُشْرِكُوا۟ بِهِۦ شَيْـًۭٔا ۖ وَبِٱلْوَٰلِدَيْنِ إِحْسَٰنًۭا وَبِذِى ٱلْقُرْبَىٰ وَٱلْيَتَٰمَىٰ وَٱلْمَسَٰكِينِ وَٱلْجَارِ ذِى ٱلْقُرْبَىٰ وَٱلْجَارِ ٱلْجُنُبِ وَٱلصَّاحِبِ بِٱلْجَنۢبِ وَٱبْنِ ٱلسَّبِيلِ وَمَا مَلَكَتْ أَيْمَٰنُكُمْ ۗ إِنَّ ٱللَّهَ لَا يُحِبُّ مَن كَانَ مُخْتَالًۭا فَخُورًا

Serve Allah, and join not any partners with Him; and do good- to parents, kinsfolk, orphans, those in need, neighbours who are near, neighbours who are strangers, the companion by your side, the wayfarer (ye meet), and what your right hands possess: For Allah loveth not the arrogant, the vainglorious;-

وَلَئِنْ أَذَقْنَٰهُ نَعْمَآءَ بَعْدَ ضَرَّآءَ مَسَّتْهُ لَيَقُولَنَّ ذَهَبَ ٱلسَّيِّـَٔاتُ عَنِّىٓ ۚ إِنَّهُۥ لَفَرِحٌۭ فَخُورٌ

But if We give him a taste of (Our) favours after adversity hath touched him, he is sure to say, "All evil has departed from me:" Behold! he falls into exultation and pride.

وَلَا تَمْشِ فِى ٱلْأَرْضِ مَرَحًا ۖ إِنَّكَ لَن تَخْرِقَ ٱلْأَرْضَ وَلَن تَبْلُغَ ٱلْجِبَالَ طُولًۭا

Nor walk on the earth with insolence: for thou canst not rend the earth asunder, nor reach the mountains in height.

تِلْكَ ٱلدَّارُ ٱلْءَاخِرَةُ نَجْعَلُهَا لِلَّذِينَ لَا يُرِيدُونَ عُلُوًّۭا فِى ٱلْأَرْضِ وَلَا فَسَادًۭا ۚ وَٱلْعَٰقِبَةُ لِلْمُتَّقِينَ

That Home of the Hereafter We shall give to those who intend not high-handedness or mischief on earth: and the end is (best) for the righteous.

وَلَا تُصَعِّرْ خَدَّكَ لِلنَّاسِ وَلَا تَمْشِ فِى ٱلْأَرْضِ مَرَحًا ۖ إِنَّ ٱللَّهَ لَا يُحِبُّ كُلَّ مُخْتَالٍۢ فَخُورٍۢ

"And swell not thy cheek (for pride) at men, nor walk in insolence through the earth; for Allah loveth not any arrogant boaster.

ٱعْلَمُوٓا۟ أَنَّمَا ٱلْحَيَوٰةُ ٱلدُّنْيَا لَعِبٌۭ وَلَهْوٌۭ وَزِينَةٌۭ وَتَفَاخُرٌۢ بَيْنَكُمْ وَتَكَاثُرٌۭ فِى ٱلْأَمْوَٰلِ وَٱلْأَوْلَٰدِ ۖ كَمَثَلِ غَيْثٍ أَعْجَبَ ٱلْكُفَّارَ نَبَاتُهُۥ ثُمَّ يَهِيجُ فَتَرَىٰهُ مُصْفَرًّۭا ثُمَّ يَكُونُ حُطَٰمًۭا ۖ وَفِى ٱلْءَاخِرَةِ عَذَابٌۭ شَدِيدٌۭ وَمَغْفِرَةٌۭ مِّنَ ٱللَّهِ وَرِضْوَٰنٌۭ ۚ وَمَا ٱلْحَيَوٰةُ ٱلدُّنْيَآ إِلَّا مَتَٰعُ ٱلْغُرُورِ

Know ye (all), that the life of this world is but play and amusement, pomp and mutual boasting and multiplying, (in rivalry) among yourselves, riches and children. Here is a similitude: How rain and the growth which it brings forth, delight (the hearts of) the tillers; soon it withers; thou wilt see it grow yellow; then it becomes dry and crumbles away. But in the Hereafter is a Penalty severe (for the devotees of wrong). And Forgiveness from Allah and (His) Good Pleasure (for the devotees of Allah). And what is the life of this world, but goods and chattels of deception?

لِّكَيْلَا تَأْسَوْا۟ عَلَىٰ مَا فَاتَكُمْ وَلَا تَفْرَحُوا۟ بِمَآ ءَاتَىٰكُمْ ۗ وَٱللَّهُ لَا يُحِبُّ كُلَّ مُخْتَالٍۢ فَخُورٍ

In order that ye may not despair over matters that pass you by, nor exult over favours bestowed upon you. For Allah loveth not any vainglorious boaster,-