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/translate/figs-metaphor]])
# for my sake
"because he trusts me" or "on my account" or "because of me"
This metaphor means the person will experience spiritual life with God. Alternate translation: "will find true life" (See: [[rc://en/ta/man/translate/figs-metaphor]])