https://everything2.com/title/Parol+Evidence+Rule
Parol Evidence Rule
No, I didn't spell parole incorrectly... the rather uncommonly used word parol is used in the same sense as one would use the word oral or verbal. This...
parol evidencerule
https://www.mass.gov/guide-to-evidence/section-1121-parol-evidence
Section 1121. Parol evidence | Mass.gov
parol evidencesection1121mass