A man was slashed in the face on a subway train in Manhattan Friday night, sources told The Post.

The attack happened just after 11 p.m. on an uptown 5 train at 125th Street station in Harlem, the sources said.

The victim — a 30-year-old man — was attacked by a tall masked man who fled the scene and is still at large, sources said. He’s being treated at the hospital.

It’s unclear what led to the slashing.

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The man who was stabbed by a fleeing assailant on the 5 subway train at E125th Street and Lexington Avenue Friday evening is attended to by paramedics inside an ambulance.

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An ambulance leaves the scene where a man was stabbed The man who was stabbed on the 5 subway train at E125th Street and Lexington Avenue Friday evening.

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Paramedics tend to a man who was stabbed by a fleeing assailant on the 5 subway train at E125th Street and Lexington Avenue on Friday night.