A 30-year-old man was knifed to death during a fight with a trio of longtime rivals in Upper Manhattan early Friday, police said.

The unidentified victim was on Convent Ave. near W. 146th St. in Hamilton Heights at about 1:30 a.m. when he got into an argument with the three suspects who began yelling at him from across the street, a witness told police.

One of the suspects stormed up to the victim and punched him in the face, cops said. During the scrape, a second suspect ran over and stabbed the victim multiple times in the body, cops said.

EMS rushed the victim to Harlem Hospital , but he could not be saved. His name was not immediately disclosed as cops track down family members.

The witness to the killing said the victim had an ongoing beef with the men who attacked him, a po

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