Psalm 39:4-6 King James Version (KJV)
4 Lord, make me to know mine end, and the measure of my days, what it is: that I may know how frail I am.
5 Behold, thou hast made my days as an handbreadth; and mine age is as nothing before thee: verily every man at his best state is altogether vanity. Selah.
6 Surely every man walketh in a vain shew: surely they are disquieted in vain: he heapeth up riches, and knoweth not who shall gather them.