'Burden' in the Bible

but this shall ye do unto them, that they may live, and not die, when they draw near unto the most holy things: Aaron and his sons shall go in, and appoint them every one to his service and to his burden;

And this shall be the charge of their burden, according to all their service in the tent of meeting: the boards of the tabernacle, and the bars thereof, and the pillars thereof, and bases thereof,

According to the commandment of Jehovah they were numbered by Moses, every one for his service, and for his burden, and numbered by him, as Jehovah had commanded Moses.

And Moses said to Jehovah, Why hast thou done evil to thy servant, and why have I not found favour in thine eyes, that thou layest the burden of all this people upon me?

And I will come down and talk with thee there; and I will take of the Spirit which is upon thee, and will put it upon them; and they shall bear the burden of the people with thee, and thou shalt not bear it alone.