Numbers 4:19-21

Amplified Bible

¹⁹ But deal with them in this way, so that they may live and not die when they approach the most holy things: Aaron and his sons shall go in and assign each of them to his [specific] work and to his load [to be carried on the march]. ²⁰ But the Kohathites shall not go in to see the holy things, even for an instant, or they will die.”

Duties of the Gershonites

²¹ Then the Lord spoke to Moses, saying,