Reference for Gittin 101:1

או דלמא קצובין ואע"פ שאינן כתובים

or is it sufficient that it should be definite even without being written down? — Come and hear: It has been stated: If a man dies and leaves two daughters and a son, and if the first [daughter] took her tenth of the property<span class="x" onmousemove="('comment',' The rule was that an orphan daughter was entitled to a tenth of her father's property on becoming of age or marrying, apart from her maintenance up to that time. ');">¹</span>

Jastrow