Message

Transmutation cantrip
Casting time: 1 Action
Range: 120 feet
Target: A creature within range
Components: S, M (a copper wire)
Duration: 1 round
Classes: Artificer, Bard, Druid, Sorcerer, Wizard
Subclasses:

You point toward a creature within range and whisper a message. The target (and only the target) hears the message and can reply in a whisper that only you can hear.

You can cast this spell through solid objects if you are familiar with the target and know it is beyond the barrier. Magical silence; 1 foot of stone, metal, or wood; or a thin sheet of lead blocks the spell.