no good deed goes unpunished
Actions of generosity often go unappreciated or are met with outright hostility or demands for further work.
ADJ
brave, daring, glorious, good, great, heroic, mighty, noble
The firefighter was praised for her brave deed in rescuing the trapped child.
dark, dastardly, dirty, evil, terrible
The detective uncovered the dark deeds that had been hidden for decades.
VERB + DEED
do, perform, perpetrate
The firefighters performed heroic deeds that saved many lives during the disaster.
PREP
in ~(s)
She promised to help, but her actions didn't match her words in deeds.