Allah Pak Gets angry over that person and Declares Zihad against him.
قَالَ رَسُوْلُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ اُمِرْتُ اَنْ اُقَاتِلَ النَّاسَ حَتّٰى يَشْهَدُوْا اَنْ لَّا اِلٰهَ اِلَّا اللهُ وَاَنَّ مُـحَمَّدًا رَّسُوْلُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ وَيُقِيْمُوا الصَّلٰوةَ وَيُؤْتُوا الزَّكٰوةَ.
Noore Mujassam, Habeebullah Hujur Pak Swallahu Alaihi Wa Sallam States,
“ I have been ordered from Allah Pak to declare Zihad and kill those who do not accept/give the statement that, Allah Pak is the only Elaah and Noore Mujassam Habeebullah Hujur Pak Swallahu Alaihi Wa Sallam is His Habeeb and Rwasul; and those who don’t establish Salaat and Collect ( Perform, Pay) Zaa’kat. ( Mishqaat Shareef)
So the person who is ignorant about Zaakat will be destroyed in this life and afterlife