Humans consist of body, soul and spirit .. When Adam fell into sin, the consequence is death, (the wages of sin is death). But it was not physical death or the body, but spirit, and was bequeathed to us until we decide, and accept Jesus as Lord and savior we are living. At the moment we die spirit, that spirit of human relationships which fall into sin cut off from His Spirit of God .. That's what the Bible calls with death.
The body is a medium where the human spirit to live and are not eternal, may perish. The soul is the feelings, thoughts, desires. While the spirit is a life or lives, who control the human will.