If any part of a single consideration for one or more objects, or of several considerations for a single object, is unlawful, the entire contract is void.
Okla. Stat. tit. 15, § 109
Effect of illegality of consideration
R.L.1910, § 929.
Official source: Oklahoma Legislature. Reproduced from public-domain Oklahoma statutes; confirm against the official source for the current text. Not legal advice.