Subayah al-Aslamiyyah gave birth a few nights after her husband's death. The Messenger of Allah ﷺ said to her, "You are now free to remarry, so marry whomever you wish."
أن سبيعة الأسلمية نفست بعد وفاة زوجها بليال، فقال لها رسول الله ﷺ: قد حللت، فانكحي من شئت.
Malik narrated it in Talaq (58), from Hisham bin Urwa, from his father, from Miswar bin Makhrama, and he related it.Bukhari narrated it in Talaq (5320) by way of Malik, with the same account.The matter is discussed at length in Minna Kubra (6/455–457).