Vox emissa volat; litera scripta manet is a legal maxim in Latin. The maxim means that the spoken word flies away; the written one remains.
The following is an example of a case law referring to the maxim:
When men sit down to put a contract in writing and do so, the assumption is they address all there is of it. All prior or contemporaneous verbal communications describing the subject matter are considered mixed in the writing. The rule to go by is The spoken word flies; the written word remains. Vox emissa volat, litera scripta manet. However, men labour under such ailments of mind and memory that common mistakes are performed, or fraud, imposition, surprise or accidents sometimes happen. In such cases, when proper results are made, relief goes in equity. But to get that relief the pleadings must support such issue and the evidence must answer the pleadings.