en_tn/1ki/08/31.md

is required to swear

AT: "someone requires him to swear" (See: rc://en/ta/man/translate/figs-activepassive)

on his own head

Here "head" refers to the whole person. AT: "on him" (See: rc://en/ta/man/translate/figs-metonymy)

the reward for his righteousness

AT: "what he deserves because of his innocence"