שְֽׂפַת־אֱ֭מֶת תִּכּ֣וֹן לָעַ֑ד וְעַד־אַ֝רְגִּ֗יעָה לְשׁ֣וֹן שָֽׁקֶר׃
The lip of truth shall be established for ever; But a lying tongue is but for a moment.
Rashi on Proverbs
A true tongue will be established forever It will be established and will endure.
Rashi on Proverbs
just for a moment In a fleeting moment, it perishes and leaves, for falsehood has no feet.