Who goes there?
Definition 1 of 1
Pro Tip 1/3Security Checkpoint
Used by guards or sentries when they hear or see someone coming and need to check who it is. 
As I approached the gate, the guard demanded, 'Who goes there?'
Pro Tip 2/3Historical Use
This phrase has old-fashioned roots, often seen in historical or fantasy contexts, like castles or military camps. 
The medieval sentry called out, 'Who goes there?' to the sound of approaching footsteps.
Pro Tip 3/3Tense Atmosphere
The phrase can add tension or suspense in stories or movies, especially at night or in a thriller scene. 
In the thriller, the guard raised his lantern and challenged, 'Who goes there?'