forswear
Cross references:
1. abjure
for.swear or fore.swear \fo.r-'swa(*)r, fo-r-, -'swe(*)r\ vt 1a: to reject
or renounce upon oath 1b: to renounce earnestly 2: to deny upon oath 3:
PERJURE {~ himself} : to swear falsely
Webster's English Dictionary