Sahih al-Bukhari 4866

It is related about "Those of you who die leaving wives behind" that Mujahid said, "This was the 'idda which she was obliged to spend in the house of her husband. Allah had revealed, 'Those of you who die leaving wives behind should make a bequest to their wives of maintenance for a year without having to leave their homes. But if they do leave you are not to blame for anything they do with themselves with correctness and courtesy.' (2:240) Allah allowed her to complete the year with seven months and twenty days as a bequest. If she wished, she could stay according to her bequest, and if she wished, she could leave as stated by Allah, 'without having to leave their homes. But if they do leave you are not to blame.' The 'idda is as has been obliged on her." He claimed that Mujahid said that. It is reported that Ibn 'Abbas said, "This ayat abrogated her 'idda with her husband's household and she does the 'idda wherever she wishes. Allah says, "without having to leave their homes'." 'Ata' said, "If she wished, she could do the 'idda with her husband's house and live according to his bequest. If she wished, she could leave by the words of Allah, 'you are not to blame for anything they do with themselves.'" 'Ata' said, "Then inheritance came [in the Qur'an] and residence was abrogated, and so she does the 'idda wherever she wishes and is not entitled to residence."