Bukhari

Narrated Abu Salama: A man came to Ibn `Abbas while Abu Huraira was sitting with him and said, "Give me your verdict regarding a lady who delivered a baby forty days after the death of her husband." Ibn `Abbas said, "This indicates the end of one of the two prescribed periods." I said "For those who are pregnant, their prescribed period is until they deliver their burdens." Abu Huraira said, I agree with my cousin (Abu Salama)." Then Ibn `Abbas sent his slave, Kuraib to Um Salama to ask her (regarding this matter). She replied. "The husband of Subai'a al Aslamiya was killed while she was pregnant, and she delivered a baby forty days after his death. Then her hand was asked in marriage and Allah's Messenger married her (to somebody). Abu As-Sanabil was one of those who asked for her hand in marriage".

And by «أولات الأحمال» is meant «ذات حمل», which means a pregnant woman.

And by «أولات الأحمال» is meant «ذات حمل», which means a pregnant woman.

Narrated Abu Salama: A man came to Ibn `Abbas while Abu Huraira was sitting with him and said, "Give me your verdict regarding a lady who delivered a baby forty days after the death of her husband." Ibn `Abbas said, "This indicates the end of one of the two prescribed periods." I said "For those who are pregnant, their prescribed period is until they deliver their burdens." Abu Huraira said, I agree with my cousin (Abu Salama)." Then Ibn `Abbas sent his slave, Kuraib to Um Salama to ask her (regarding this matter). She replied. "The husband of Subai'a al Aslamiya was killed while she was pregnant, and she delivered a baby forty days after his death. Then her hand was asked in marriage and Allah's Messenger married her (to somebody). Abu As-Sanabil was one of those who asked for her hand in marriage".

And Sulaiman bin Harb and Al-Nu’man narrated that Hammad bin Zaid narrated to us, from Ayyub, and from him Muhammad bin Sirin narrated that:
I was present in a gathering in which Abdur Rahman bin Abi Laila was also present. His students used to respect him greatly. There, I narrated the statement of Sabi’ah bint Al-Harith from Abdullah bin Utbah bin Mas’ud, upon which one of his students warned me by biting his lip and making gestures with his tongue and eyes. Muhammad bin Sirin narrated that I understood and said that Abdullah bin Utbah is still alive in Kufa. If I attribute a lie to him, it would be a great boldness. The person who warned me became embarrassed at this, and Abdur Rahman bin Abi Laila said, “But his uncle did not say this.” (Ibn Sirin narrated that) Then I met Abu Atiyyah Malik bin Amir and asked him about this issue. He also began to narrate the hadith of Sabi’ah, but I asked him, “Have you also heard anything about this from Abdullah bin Mas’ud (may Allah be pleased with him)?” He narrated that we were present in the service of Abdullah bin Mas’ud (may Allah be pleased with him), so he said, “Do you want to be harsh on her (whose husband has died and she is pregnant, by prolonging the period of waiting) and are not ready to grant ease and concession? The fact is that the small Surah An-Nisa (i.e., Surah At-Talaq) was revealed after the big Surah An-Nisa, and he said «وأولات الأحمال أجلهن أن يضعن حملهن‏» the verse, and the waiting period for pregnant women is until they deliver their pregnancy.”