Hush

Enchantment cantrip
Casting time: 1 action
Range: 20 feet
Target: one creature within range
Components: V, M (a pinch of cinnamon)
Duration: Concentration, up to 1 round
Classes: Bard, Cleric, Warlock, Wizard
Subclasses: Bard (College of Bells)

You supress a creature's voice for a fleeting moment. Choose one creature within range. The target must succeed on a Wisdom saving throw or be rendered incapable of speech until the end of its next turn, at which point the spell ends.