Sahih al-Bukhari Book 68, Hadith 33
Aisha intended to buy Barira, but her masters stipulated that her wala wound be for them. Aisha mentioned that to the Prophet (ﷺ) who said (to `Aisha), "Buy and manumit her, for the wala is for the one who manumits." Once some meat was brought to the Prophet (ﷺ) and was said, "This meat was given in charity to Barira. " The Prophet (ﷺ) said, "It is an object of charity for Barira and a gift for us."
Narrated Adam:
Shu`ba related the same Hadith and added: Barira was given the option regarding her husband.
Barira's husband was a slave called Mughith, as if I am seeing him now, going behind Barira and weeping with his tears flowing down his beard. The Prophet (ﷺ) said to `Abbas, "O `Abbas ! are you not astonished at the love of Mughith for Barira and the hatred of Barira for Mughith?" The Prophet (ﷺ) then said to Barira, "Why don't you return to him?" She said, "O Allah's Messenger (ﷺ)! Do you order me to do so?" He said, "No, I only intercede for him." She said, "I am not in need of him."
Whenever Ibn `Umar was asked about marrying a Christian lady or a Jewess, he would say: "Allah has made it unlawful for the believers to marry ladies who ascribe partners in worship to Allah, and I do not know of a greater thing, as regards to ascribing partners in worship, etc. to Allah, than that a lady should say that Jesus is her Lord although he is just one of Allah's slaves."