Musnad Ahmad 1156:203

Yazid ibn Harun narrated to us, he said: Yahya ibn Sa'id informed us, that Sulayman ibn Yasar informed him, that Abu Salamah informed him, that he and Ibn Abbas gathered at Abu Hurayrah’s. They sent Kurayb, the freed slave of Ibn Abbas, to Umm Salamah to ask her. Umm Salamah mentioned that Subay'ah al-Aslamiyyah’s husband died, and she gave birth a few nights after him. Subay'ah mentioned that to the Messenger of Allah, peace and blessings of Allah be upon him, and he commanded her to marry.