Albert Barnes Commentary 1 Kings 8:31

"If a man sin against his neighbor, and an oath be laid upon him to cause him to swear, and he come [and] swear before thine altar in this house;" — 1 Kings 8:31 (ASV)

The oath come before ... - "The oath" is equivalent to "the man who swears the oath." A slight alteration in the present Hebrew text gives the sense "and he (the accused) go and swear before your altar," etc. The threats and the promises, the punishments and calamities of 1 Kings 8:31–38 were distinctly named in the Law. See the margin reference.