Musnad Ahmed: Hadith 2530

The husband of Bareerah was a black slave who was called Mugheeth. I used to see him following Bareerah in the streets of Madinah, weeping for her. The Prophet (ﷺ) gave four rulings concerning her. Her masters stipulated that wala' was for them, but the Prophet (ﷺ) ruled: “Wala' belongs to the one who manumits the slave." He gave her the choice, and she chose divorce, and he ordered her to observe ‘iddah. And she received charity and gave some of it as a gift to 'A'ishah (رضي الله عنھا); she mentioned that to the Prophet (ﷺ) and he said: "It is a charity for her and a gift to us."