Yiddish: It's a mitzvah to pull a hair out of a pig.

It's a worthy accomplishment to extract even the smallest charity from a miser.  SOURCE: Bernstein, Jüdische Sprichwörter und Redensarten. A mitzvah can be thought of as a good deed; more precisely, it is a commandment or the fulfillment of a commandment.  Compare:

Even a hair from a pig is good. | Fun a khazer a hor iz oykh gut. | .פֿון אַ חזיר אַ האָר איז אויך גוט

SOURCE: Stutchkoff, Der Oytser fun der Yidisher Shprakh

אַ מיצווה פֿון אַ חזיר אַ האָר אויסצורײַסן.

A mitsve, fun a khazer a hor oystsuraysn.

It's a mitzvah to pull a hair out of a pig.