Maarif-ul-Quran
59:6 - 59:6

[ 1] fai' is a term for the properties left over by the non-Muslims and possessed by a Muslim state without fighting. As opposed to this, ghanimah (booty) is a property taken over by fighting. The properties of Bani Nadir were taken over without fighting, hence the word fai'. That is why we did not translate fai' as 'booty'. (Muhammad Taqi Usmani)