Ventriloquism

For the duration, your voice can issue from someplace else you choose within range, such as from another creature, a statue, from behind a door, down a passage, etc.

You are able to make your voice sound as if a different creature was speaking or making the noise, but if you do so, a creature familiar with the voice can determine that it is an illusion with a successful Intelligence (Investigation) check against your spell save DC. The check is made with disadvantage if the creature can recognize the voice but isn't very familiar with it. If a creature discerns the illusory voice for what it is, that voice becomes faint and the creature can possibly hear the real voice's location.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the duration is concentration, up to 1 hour.  If you use a spell slot of 5th level or higher, the duration is 8 hours. If you use a spell slot of 7th level or higher, the duration is 24 hours. If you use a 9th level spell slot, the spell lasts until it is dispelled. Using a spell slot of 5th level or higher grants a duration that doesn't require concentration.

Adapted from 1st edition AD&D