Sunan An-Nasa'i

Abu Salamah bin 'Abdur-Rahman said:""Ibn 'Abbas, Abu Hurairah and I were together, and Ibn 'Abbas said: 'If a woman gives birth after her husband dies, her 'Iddah is the longer of the two periods.'"" Abu Salamah said: ""We sent Kuraib to Umm Salamah to ask her about that. He came to us and told us from her that the husband of Subai'ah died and she gave birth a few days after her husband died, and the Messenger of Allah told her to get married