Read Exodus 18:18 Using Other Translations
Thou wilt surely wear away, both thou, and this people that is with thee: for this thing is too heavy for thee; thou art not able to perform it thyself alone.
You and the people with you will certainly wear yourselves out, for the thing is too heavy for you. You are not able to do it alone.
“You’re going to wear yourself out—and the people, too. This job is too heavy a burden for you to handle all by yourself.