Ecclesiastes 3:19-22

19For people and animals share the same fate—both breathe and both must die. So people have no real advantage over the animals. How meaningless!

20Both go to the same place—they came from dust and they return to dust.

21For who can prove that the human spirit goes up and the spirit of animals goes down into the earth?

22So I saw that there is nothing better for people than to be happy in their work. That is our lot in life. And no one can bring us back to see what happens after we die.