The incident happened just before 7:00 a.m.
Police say the victim had been drinking all night and was making noise outside of a garden-style apartment building on the 4200 block of 2nd Road N. An angry resident came out and confronted the man about the noise, and a verbal altercation ensued, according to Arlington County Police Department spokesman Dustin Sternbeck.
During the argument, the resident pulled out a knife and stabbed the victim in the left torso, below the armpit, Sternbeck said.
The victim was transported to George Washington University Hospital and is expected to be okay. The suspect is in custody and is being interviewed by police.