Here "by the hand" is an idiom that means to be the specific cause of something. Alternate translation: "would not be killed by the one" (See: [[rc://en/ta/man/translate/figs-idiom]])
This can be stated in active form. See how you translated a similar phrase in [Joshua 20:3](./03.md). Alternate translation: "avenge a person's death" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-activepassive]])