Shulchan Aruch
by Yosef Karo, translated from Hebrew by Wikisource
Choshen Mishpat 6
2498752Shulchan Aruch — Choshen Mishpat 6Yosef Karo

1. Judges do not sit to judge a case of less than a perutah. If they started the case for a perutah, they may finish the case- even if the result is a ruling of less than a perutah.