Death is now part of this world because of our sins, at the beginning in the book of genesis the first two human on earth commited sin, and since then death entered this world as the result of the sin.
Romans 5:12 explains that “through one man sin entered the world, and death through sin.”
Since then, every human being experiences death because all people live in a fallen world affected by sin.
We should also know that death have made our life here on earth to be temporary, which means we can die any day.
Ecclesiastes 3:2 says there is “a time to be born and a time to die.”
Human beings are mortal, and no one can escape death through human strength or wisdom. Yet God uses this reality to remind people to seek Him, live righteously, and place their hope in eternal life rather than earthly things.