Doubletalk

You use magic to deliver your words more carefully, deciding whom hears what. While this spell is active, whenever you speak, you can choose to magically hide words in your speech only audible to those you desire. Choose any number of creatures who can hear you. These creatures will hear you say different words from those you actually spoke, of your choice. If a creature knows the spell is being cast, such as through truesight, use of detect magic, or foreknowledge, they can make an Insight or Investigation check against your spell save DC when they hear you. On a success, the creature hears both messages simultaneously.