Two young boys, just 12 and 15 years old, stabbed a good Samaritan who tried to stop the youngsters from ganging up on someone else on a Brooklyn street late Tuesday, cops and sources said.

The 41-year-old victim was walking his dog at Starr Street and Irving Avenue in Bushwick around 7:40 p.m. when he spotted the pint-sized perps harassing another person and stepped in, law enforcement sources said.

The young ruffians then turned on the man, knifing him in the armpit and stomach, police said.

The 41-year-old victim was walking his dog when he spotted the two young ruffians harassing another person, sources said. Paul Martinka

The victim, of Ridgewood, Queens, was taken to the Elmhurst Hospital Center, where he was listed in stable condition, authorities said.

Both juveniles were tak

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