Mishnah 7 - Chapter 4 - Pirkei Avot

R. Yishmael, his son, says: One (a judge) who avoids judging [when there is (present) one greater than he, or when he persuades the litigants to compromise] removes himself from hatred [(for one who leaves beth-din liable hates the judge, saying in his heart "He did not try to find things in my favor")], and from theft [Perhaps he incriminated an innocent person and, in effect, robbed him], and from a vain oath, [which he may have wrongly imposed on one not liable for an oath. Or perhaps the tanna calls a false oath a vain oath, as when he (the defendant) [vainly] swore that he did not borrow, when he really did.] And one who is "haughty" in judgment, [judging without adequate review or deliberation] is a fool, an evildoer, and a man of arrogance.