The Rules of Firk State

The military at the time was voluntary meaning what do I mean voluntary it wasn't a paid military. Those who participated in battles there are rulings of Firk for how much Rani'ma they get. Hajj is an act of worship and with worldly monetary niyya this is 100% halal by unanimous consensus of all the scholars of Islam. The Prophet sasim himself said the best salary anybody can ever take is for teaching Quran.