PHB
Message
0-level (Cantrip) Transmutation
Casting Time: 1 action
Range/Area: 120 feet
Components: V, S, M
Materials: a short piece of copper wire
Duration: 1 round
You point your finger 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, 1 inch of common metal, a thin sheet of lead, or 3 feet of wood blocks the spell. The spell doesn't have to follow a straight line and can travel freely around corners or through openings.
At higher levels: At 5th Level. The spell has a range of 300 feet.
At 11th Level. You can ignore the somatic and material components of the spell.
At 17th Level. You can ignore the verbal component of the spell, sending the message to your target telepathically instead. A simple mental image may accompany this message, and your target can reply in the same way.
Available for: Bard, Sorcerer, Wizard