Sunan Ibn Majah 1958
سنن ابن ماجه#1958SahihIt was narrated from 'Aishah:that the Messenger of Allah (ﷺ) set Safiyyah free, and made her ransom her dowry, and he married her
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih Lighairihi
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih
In-book reference: 9:114