Psalm 39:4 in the World English Bible
“LORD, show me my end, what is the measure of my days. Let me know how frail I am.
Context
3 My heart was hot within me, while I was musing the fire burned: then spake I with my tongue,
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.