Yosef Karo, Shulchan Aruch — Choshen Mishpat 3
“ Paragraph 4 Even though a Court of three judges is a full Court, whenever there are many judges, they are praiseworthy. And it is better that they split the judgment with eleven rather than with ten . It is required that all who sit in the Court of Law must be scholars and fit to do so. It is forbidden for a wise man to sit in judgment until he knows with whom he sits, lest he sit with people who are not suitable for the task and is then found to be included in a council of traitors and not in a Court of Law. ”
