I stayed in Lan Zhi's room for a long time and didn't smell its fragrance. I stayed in the abalone place for a long time and didn't smell its odor source.

From the Western Han Dynasty Liu Xiang's "The Book of the Later Han Dynasty", the full text is "Living by goodness, such as entering the room, not smelling its fragrance for a long time; Living with the wicked, like entering the boss of abalone, has been unheard of for a long time, which means:

Living with a virtuous person is like entering a room full of orchid fragrance. After a long time, I will be full of fragrance because of edification, so I can't smell orchid flowers. Living with people with poor quality is like selling abalone in the market. After a long time, even you stink, so you don't think abalone stinks. Explain that the environment can change a person.