A man scrawled anti-Semitic grafitti on some 20 walls and cars in a predominently Hasidic section of Brooklyn Saturday night — and then fled, police said.

The man, who is Asian and in his 30s, used red and pink paint in his hate-filled spree.

“It was very offensive stuff,’’ a police source said.

Councilman David G. Greenfield, who represents the area, said, “It is unconscionable that someone would spray such hateful graffiti across our community — the crime is only more appalling that it was done on the holiest day of our week.’’

He said the NYPD is investigating it as a hate crime.