Psalm 39:6
Surely every man walks in a vain show: surely they are disquieted in vain: he heaps up riches, and knows not who shall gather them.
Nave's Topical Index—AKJV

Psalm 127:2
It is vain for you to rise up early, to sit up late, to eat the bread of sorrows: for so he gives his beloved sleep.
Nave's Topical Index—AKJV