'Task' in the Bible

I applied my mind to seek and to search by wisdom all that is done under the heavens. It [is] a grievous task God has given to {humans}.

For to the person who [is] good in his eyes, he gives wisdom, knowledge, and joy; but to the sinner he gives the task of gathering and heaping up only to give [it] to [him who is] pleasing to him. This also [is] vanity and chasing wind!