But Moses' father-in-law said to him, "What you are doing is not good.

Exodus 18:16
"Whenever they have a dispute, it is brought to me to judge between one man and another, and I make known to them the statutes and laws of God."

Exodus 18:18
Surely you and these people with you will wear yourselves out, because the task is too heavy for you. You cannot handle it alone.

And Moses' father in law said to him, The thing that you do is not good.