A doorkeeper; gatekeeper.

Verily, verily, I say unto you, He that entereth not by the door into the sheepfold, but climbeth up some other way, the same is a thief and a robber. But he that entereth in by the door is the shepherd of the sheep. To him the PORTER openeth; and the sheep hear his voice: and he calleth his own sheep by name, and leadeth them out. ( John 10:1-3 )