Reference for Yevamot 134:2
דאמר רב נחמן אמר שמואל יתומים שבאו לחלוק בנכסי אביהם ב"ד מעמידין להם אפוטרופוס ובורר להם חלק יפה הגדילו יכולין למחות ורב נחמן דידיה אומר הגדילו אין יכולין למחות דא"כ מה כח ב"ד יפה
in accordance with a ruling of R. Nahman in the name of Samuel. For R. Nahman stated in the name of Samuel: Where orphans<span class="x" onmousemove="('comment',' Who are minors. ');"><sup>4</sup></span> wish to divide the property of their [deceased] father, <i>Beth din</i> appoint a guardian for [every one of] them, and [each guardian] chooses for his ward a suitable portion. As soon, however, as they reach their majority they are entitled to enter a protest.<span class="x" onmousemove="('comment',' Against the original division, and to demand a new one. The validity of acceptance of the shares by the guardians extends only to the produce or yield of the estate up to the date of the protest. ');"><sup>5</sup></span> In his own name, however, R. Nahman stated: Even when they reach majority they are not entitled to protest, for otherwise what validity is there in the authority of a <i>Beth din</i>!<span class="x" onmousemove="('comment',' V. Kid. Sonc. ed., p. 210, notes. ');"><sup>6</sup></span>