17 Yitro

(19) Now listen to me. I will give you counsel, and God be with you! You represent the people before God: you bring the disputes before God, (20) and enjoin upon them the laws and the teachings, and make known to them the way they are to go and the practices they are to follow. (21) You shall also seek out, from among all the people, capable individuals who fear God—trustworthy ones who spurn ill-gotten gain. Set these over them as chiefs of thousands, hundreds, fifties, and tens, and (22) let them judge the people at all times. Have them bring every major dispute to you, but let them decide every minor dispute themselves. Make it easier for yourself by letting them share the burden with you. (23) If you do this—and God so commands you—you will be able to bear up; and all these people too will go home unwearied.”

AND LET THEM JUDGE THE PEOPLE AT ALL TIMES. The meaning thereof is that “when there will be many judges available, the oppressed one will go to the judge at any time he desires and he will find him ready [to listen to his grievance]. He cannot come near you [i.e., Moses] at any time because of the great multitude of people before you and on account of your many preoccupations. The result of this is that many of them will rather tolerate the violence committed against them because they have no opportunity to tell it to you. They do not want to abandon their work and affairs to wait for a free moment when they will be able to approach you.” This is the sense of the expression, each one shall go to his place in peace. At present, because they cannot come near for judgment at all times, they will not rest in peace, since this opens a door for unjust people to commit violence and for oppressors to cause contention. And the meaning of the expression to his place is that to whatever place they will come, [they will live in peace] as long as they are in the camp in the wilderness.
From the language, And let them judge the people ‘at all times,’ our Rabbis have derived the principle that in civil cases, the verdict may be reached even during the night, since it does not say here, “[and let them judge the people] the whole day.”