All people are like grass.

A voice says, “Cry out.” 
And I said, “What shall I cry?” “All people are like grass, 
and all their faithfulness is like the flowers of the field. The grass withers and the flowers fall, 
because the breath of the Lord blows on them. 
Surely the people are grass. 
Isaiah 40:6-7

A thousand years in your sight are like a day that has just gone by, or like a watch in the night. Yet you sweep people away in the sleep of death— they are like the new grass of the morning: In the morning it springs up new, but by evening it is dry and withered. 
Psalm 90:4-6