一清二白

tā yī qīng èr bái bù pà bié rén shuō shén me

他一清二白，不怕别人说什么。

He has a clear conscience and therefore does not care what others say about him.

dào jīn tiān wéi zhǐ tā de zhí yè cāo shǒu yī qīng èr bái

到今天为止，他的职业操守一清二白。

So far his integrity for work is unblemished.