Both of these phrases have similar meaning and may be intended to be in poetic form. Alternate translation: "Since you have killed people, you will also be killed" (See: [[rc://en/ta/man/translate/figs-parallelism]])
This is a polite way of referring to killing people. Alternate translation: "killed the sons of other women, so shall I kill your mother's son" (See: [[rc://en/ta/man/translate/figs-euphemism]])