Correct

口说无凭

/ kǒu shuō wú píng /
Strokes

Definition

(idiom) you can't rely on a verbal agreement/just because sb says sth, doesn't mean it's true

Example

Definition

verbal statements are no guarantee

1
Kǒushuōpíng
口说无凭
  
,
wéi
  

A verbal statement being no guarantee, a written agreement is hereby made. / Verbal statements are no guarantee. This written pledge will serve as proof.

Related

口说无凭