Sahih al-Bukhari Book 68, Hadith 67
(the wife of the Prophet) A lady from Bani Aslam, called Subai'a, become a widow while she was
pregnant. Abu As-Sanabil bin Ba'kak demanded her hand in marriage, but she refused to marry him
and said, "By Allah, I cannot marry him unless I have completed one of the two prescribed periods."
About ten days later (after having delivered her child), she went to the Prophet (ﷺ) and he said (to her),
"You can marry now."
Rifa`a Al-Qurazi married a lady and then divorced her whereupon she married another man. She came to the Prophet (ﷺ) and said that her new husband did not approach her, and that he was completely impotent. The Prophet (ﷺ) said (to her), "No (you cannot remarry your first husband) till you taste the second husband and he tastes you (i.e. till he consummates his marriage with you).
that his father had written to Ibn Al-Arqam a letter asking him to ask Subai'a Al-Aslamiya how the Prophet had given her the verdict. She said, "The Prophet, gave me his verdict that after I gave birth, I could marry."