'Toiled' in the Bible

So I hated all the fruit (gain) of my labor for which I had labored under the sun, because I must leave it to the man who will succeed me.

And who knows whether he will be a wise man or a fool? Yet he will have control over all the fruit of my labor for which I have labored by acting wisely under the sun. This too is vanity (futility, self-conceit).

For there is a man who has labored with wisdom and knowledge and skill, yet gives his legacy to one who has not labored for it. This too is vanity and a great evil.

For what does a man get from all his labor and from the striving and sorrow of his heart with which he labors under the sun?

“Yet you have not called on Me [in prayer and worship], O Jacob;But you have grown weary of Me, O Israel.

The Lord has sworn [an oath] by His right hand and by His mighty arm,“I will never again give your grain as food for your enemies,Nor will [the invading] foreigners drink your new wine for which you have labored.”

“But the shameful act [of idolatry] has consumed the labor of our fathers since our youth—their flocks and their herds, their sons and their daughters.