Psalm 39:5-6

5You have made my days a mere handbreadth; the span of my years is as nothing before you. Everyone is but a breath, even those who seem secure. The Hebrew has Selah (a word of uncertain meaning) here and at the end of verse 11.

6“Surely everyone goes around like a mere phantom; in vain they rush about, heaping up wealth without knowing whose it will finally be.