وَ أَمَّا مَا شَرَطَ عَلَيْهِنَّ فَإِنَّهُ أَمَرَهَا أَنْ...
And as for what He -azwj Stipulated against them, so He -azwj Commanded her that she should wait, when her husband dies from her, for four months and ten (days). Thus, He -azwj Took from her for him during his death, what he Took for her from him during his lifetime with the oathing.
Allah -azwj Says [2:234] they should keep themselves in waiting for four months and ten , and did not Mention the ‘ten days’ in the waiting period except with the four months, and Knows that the limit of the patience of the woman is four months regarding the neglect of the copulation, So from then it Obligates against her and for her’.
A number of our companions, from Ahmad Bin Muhammad Bin Khalid, and Ali Bin Ibrahim, from his father, from Usman Bin Isa, from Sama’at who said, ‘He -asws said: ‘The woman widowed from her husband, the pregnant, her term is the later of the two terms when she was pregnant.
So when there would be completed for her four months and ten (days) and she had not placed (given birth), so her waiting period would be to placing it (giving birth); if it was that she places her load (gives birth) before the completion of her four months and ten (days), she would wait after what she placed (gave birth to), the complete four months and ten (days), and that is the further of the two terms’.