Praise be to Allah.

Reference to Zakah recipients in the Quran

There are eight categories on which zakah must be spent, which Allah has explained clearly. He states that this is a duty imposed by Allah and that it is based on knowledge and wisdom. Allah, may He be exalted, says (interpretation of the meaning): 

“As-Sadaqat (here it means zakah) are only for the Fuqara (poor), and Al-Masakin (the poor) and those employed to collect (the funds); and to attract the hearts of those who have been inclined (towards Islam); and to free the captives; and for those in debt; and for Allah’s Cause (i.e. for Mujahidun — those fighting in a just battle), and for the wayfarer (a traveller who is cut off from everything); a duty imposed by Allah. And Allah is All-Knower, All-Wise.” [al-Tawbah 9:60]

...

 And Allah knows best.

Reference: 

Majmu’ Fatawa Ibn ‘Uthaymin (18/331-339).