The 35-year-old victim was stabbed in the neck and lower back at the Delancey St-Essex St Station sometime after 5:30 a.m.
He was taken to Bellevue Hospital in stable condition.
Police say the attacker, a man wearing a white hoodie, fled the station.
Authorities say the victim knows the suspect and the two have an ongoing dispute.
No arrests have been made.
The crime is under investigation.
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