Not to appoint as a judge, a person who is not well versed in the laws of the Torah, even if he is expert in other branches of knowledge

Deuteronomy 1:17

KJV

Ye shall not respect persons in judgment; but ye shall hear the small as well as the great; ye shall not be afraid of the face of man; for the judgment is God’s: and the cause that is too hard for you, bring it unto me, and I will hear it.

ASV

Ye shall not respect persons in judgment; ye shall hear the small and the great alike; ye shall not be afraid of the face of man; for the judgment is God’s: and the cause that is too hard for you ye shall bring unto me, and I will hear it.

WEB

You shall not show partiality in judgment; you shall hear the small and the great alike. You shall not be afraid of the face of man, for the judgment is God’s. The case that is too hard for you, you shall bring to me, and I will hear it.”

JPS

Ye shall not respect persons in judgment; ye shall hear the small and the great alike; ye shall not be afraid of the face of any man; for the judgment is God’s; and the cause that is too hard for you ye shall bring unto me, and I will hear it.’