Exodus 18:15

Now Moses used to take the tent and pitch it outside the camp, a good distance from the camp, and he called it the tent of meeting. And everyone who sought Yahweh would go out to the tent of meeting which was outside the camp.

And they put him in custody so that the command of Yahweh might be made clear to them.

But there were some men who were unclean because of a dead person, so that they could not celebrate Passover on that day; so they came near before Moses and Aaron on that day.

Moses therefore said to them, “Wait, and I will listen to what Yahweh will command concerning you.”