Ecclesiastes 3:21

"Who knoweth the spirit of man that goeth upward, and the spirit of the beast that goeth downward to the earth?"

Cross References (ranked by relevance)

Then shall the dust return to the earth as it was: and the spirit shall return unto God who gave it.

For we know that if our earthly house of this tabernacle were dissolved, we have a building of God, an house not made with hands, eternal in the heavens.

John 14:3

And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also.

Philippians 1:23

For I am in a strait betwixt two, having a desire to depart, and to be with Christ; which is far better:

2 Corinthians 5:8

We are confident, I say, and willing rather to be absent from the body, and to be present with the Lord.

Acts 1:25

That he may take part of this ministry and apostleship, from which Judas by transgression fell, that he might go to his own place.