'Burden' in the Bible

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].

from thirty years and upward even to fifty years old, everyone who could enter to do the work of service and the work of carrying in the Tent of Meeting (tabernacle);

So Moses said to the Lord, “Why have You been so hard on Your servant? And why have I not found favor in Your sight, that You have placed the burden of all these people on me?

I am not able to carry all these people alone, because the burden is too heavy for me.

Then I will come down and speak with you there, and I will take away some of the Spirit who is upon you, and will put Him upon them; and they shall bear the burden of the people with you, so that you will not have to bear it all alone.