expression, godan verb (-su)
you cannot excuse a bad deed with a petty act of benevolence; steal a pig and give the feet for alms
Proverb meaning that a small good deed cannot make up for a serious wrongdoing. The literal image is stealing a pig but then giving away its feet as charity.
He embezzled company money and then tried to improve his reputation by making donations, but that's like stealing a pig and giving the feet for alms.