Sunan an-Nasa'i 4140
سنن النسائي#4140SahihIt was narrated that 'Umar said:"The wealth of Banu An-Nadir was among the Fay' that Allah bestowed upon His Messenger, in cases where the Muslims did not go out on and expedition with horses and camels. From it he kept for himself food for one year, and what was left he spent on cavalry and weapons equipment for the cause of Allah
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 38:8