The word “spirit” is translated from the Hebrew word ruʹach, meaning the life-force. The spirit is our life-force.
This life-force is in each of the body cells of both humans and animals. It is sustained, or kept alive, by breathing. At death the life-force in time leaves all the body cells and the body begins to decay.
Speaking about man’s death, Ecclesiastes 12:7 states: “The dust [of his body] returns to the earth, just as it was, and the spirit returns to the true God who gave it.” When the spirit, or life-force, leaves the body, the body dies and returns to where it came from—the earth. Comparably, the life-force returns to where it came from—God. (Job 34:14-15; Psalm 36:9)
This does not mean that the life-force actually travels to heaven. Rather, it means that for someone who dies, any hope of future life rests with Jehovah God. His life is in God’s hands, so to speak. Only by God’s power can the spirit, or life-force, be given back so that a person may live again.
Consider, for example, what the Scriptures say about Jesus Christ’s death. The Gospel writer Luke relates: “Jesus called with a loud voice and said: ‘Father, into your hands I entrust my spirit.’ When he had said this, he expired.” (Luke 23:46) As Jesus’ spirit, or life-force, went out of him, he was not literally on his way to heaven. Jesus was not resurrected from the dead until the third day, and it was 40 days later that he ascended to heaven. (Acts 1:3, 9) At the time of his death, however, Jesus confidently left his spirit, or life- force, in his Father’s hands, fully trusting in Jehovah’s ability to bring him back to life.