This does not mean the person must necessarily die. It is a metaphor that means the person will consider obeying Jesus as being more important than his own life. (See: [[rc://en/ta/man/jit/figs-metaphor]])
This metaphor means the person will experience spiritual life with God. Alternate translation: "will find true life" (See: [[rc://en/ta/man/jit/figs-metaphor]])