The sin of a person who does not pay Zakat

وَقَوْلِ اللَّهِ تَعَالَى: {وَالَّذِينَ يَكْنِزُونَ الذَّهَبَ وَالْفِضَّةَ وَلاَ يُنْفِقُونَهَا فِي سَبِيلِ اللَّهِ فَبَشِّرْهُمْ بِعَذَابٍ أَلِيمٍ يَوْمَ يُحْمَى عَلَيْهَا فِي نَارِ جَهَنَّمَ فَتُكْوَى بِهَا جِبَاهُهُمْ وَجُنُوبُهُمْ وَظُهُورُهُمْ هَذَا مَا كَنَزْتُمْ لأِنْفُسِكُمْ فَذُوقُوا مَا كُنْتُمْ تَكْنِزُونَ}.And the Statement of Allah تعالى: “…And those who hoard up gold and silver (Al-Kanz — money, gold and silver, the Zakat of which has not been paid) and spend them not in the Way of Allah, announce unto them a painful torment. On the Day when that (Al-Kanz) will be heated in the fire of Hell and with it will be branded their foreheads and their flanks, and their backs (and it will be said to them): ‘This is the treasure which you hoarded for yourselves. Now taste of what you used to hoard.’” (V.9:34-35)