מדרש על גיטין 176:22

R. Yehudah says: "And these are the judgments" (alluded to) in Marah, viz. (Exodus 15:25) "There (in Marah) He made for them statute and judgment." R. Elazar b. Azaryah says: I might think that if gentiles judged according to the laws of Israel their judgments stand; it is, therefore, written "And these are the judgments": From here it was ruled: Divorce under coercion — by an Israelite (court) is valid; by a gentile (court), invalid. But if gentiles coerce him, saying: Do as the Israelites ruled, it is valid. R. Shimon says: Why do (the mitzvoth of) adjudication take precedence over all the mitzvoth of the Torah? For when there is litigation between a man and his neighbor, there is strife between them. Once the ruling has been given, there is peace between them. And thus did Yithro say (Exodus 18:23) "If you do this thing (i.e., if you provide for adjudication) … then all this people will come to their place in peace."