Psalms 39:4

"LORD, make me to know my end, And what is the measure of my days, That I may know how frail I am.

Surrounding context

39:3 My heart was hot within me; While I was musing, the fire burned. Then I spoke with my tongue:

39:4 "LORD, make me to know my end, And what is the measure of my days, That I may know how frail I am.

39:5 Indeed, You have made my days as handbreadths, And my age is as nothing before You; Certainly every man at his best state is but vapor.Selah

Translation and sources