Ecclesiastes 2:17-21

So I hated life, for the work which had been done under the sun was unhappy to me; because everything is futility and striving after wind. The Futility of Labor

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

And who knows whether he will be wise 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 futility.

Therefore I completely despaired over all the fruit of my labor for which I had labored under the sun.

When there is a person who has labored with wisdom, knowledge, and skill, and then gives his legacy to one who has not labored for it; this too is futility and a great evil.