An existing legal obligation resting upon the promisor, or a moral obligation originating in some benefit conferred upon the promisor, or prejudice suffered by the promisee, is also a good consideration for a promise, to an extent corresponding with the extent of the obligation, but no further or otherwise.
Okla. Stat. tit. 15, § 107
Moral or legal obligation on promisor good as consideration
R.L.1910, § 927.
Official source: Oklahoma Legislature. Reproduced from public-domain Oklahoma statutes; confirm against the official source for the current text. Not legal advice.