Narrated Abdullah ibn Abu Bakr: Abdullah ibn Abu Bakr and some children of Muhammad ibn Maslamah said: There remained some people of Khaybar and they confined themselves to the fortresses. They asked the Messenger of Allah ﷺ to protect their lives and let them go. He did so. The people of Fadak heard this; they also adopted a similar way. (Fadak) was, therefore, exclusively reserved for the Messenger of Allah ﷺ, for it was not captured by the expedition of cavalry and camelry.
Related hadith on this topic
Explanation & Benefits
Shaykh Umar Farooq Saeedi
Benefits and Issues:
During the siege of others, through a message of reconciliation, two forts of Khaybar—Wathih and Sulalim—came under the control of the Muslims.
After allocating a portion of the wealth of Banu Nadir for his family and urgent humanitarian needs, the Messenger of Allah (sallallahu alayhi wa sallam) distributed the remainder among the Muhajirun (Emigrants).
This has already been mentioned in previous authentic ahadith.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 2971