Al-Hashr 59:6 وما افاء الله على رسوله منهم فما اوجفتم عليه من خيل ولا ركاب ولاكن الله يسلط رسله على من يشاء والله على كل شيء قدير ٦

The Fai' and how it is spent

Allah the Exalted explains the regulations for Fai', the booty that the Muslims acquire from the disbelievers, without fighting them or using cavalry and camelry in war against them. For instance, the booty collected from Bani An-Nadir was not acquired because of fighting