Which article of the constitution of 1973 is related to the affairs of Zakat?

Which article of the constitution of 1973 is related to the affairs of Zakat?

سن 1973 کے آئین کا کون سا آرٹیکل زکوٰۃ کے معاملات سے متعلق ہے؟
Explanation

Article 31 of the 1973 Constitution of Pakistan deals with Zakat.

It establishing a system to support the welfare of the needy.