Reference for Bava Batra 287:4
פשיטא מהו דתימא כיון דלאו דרכה למטרח אף על גב דלא פריש כמו דפריש דמי קמשמע לן:
[Is this not] obvious?<span class="x" onmousemove="('comment',' Why was it necessary for our Mishnah to restate it in the case of a widow, seeing that the law had already been stated in regard to brothers. ');"><sup>9</sup></span> — It might have been assumed [that] since it is not usual for her to look after an orphan's estate<span class="x" onmousemove="('comment',' Lit., 'to take the trouble'. ');"><sup>10</sup></span> [she is entitled to all the profits], even where she did not [first] make a specific declaration,<span class="x" onmousemove="('comment',' Lit., 'specified'; that she desired the estate to be divided and that she intended to make the improvements in her interests alone. ');"><sup>11</sup></span>