Sunan an-Nasa'i 4659
سنن النسائي#4659SahihIt was narrated that Ibn 'Umar said:"The Messenger of Allah forbade selling loyalty or giving it away." (Sahih)
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: 44:211