各人自扫门前雪，莫管他家瓦上霜 gèrénzìsǎoménqiánxuě, mòguǎntājiāwǎshàngshuāng mind your own business
Sweep the snow from your own doorstep and don't worry about the frost on your neighbor's roof; to mind one's own business and ignore the concerns of others.