Ecclesiastes 2:17-19

Amplified Bible

¹⁷ So I hated life, for the work which had been done under the sun caused me only great sorrow; because all is futility and chasing after the wind.

The Futility of Labor

¹⁸ 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.^{(A) 19} 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).