Correct
一尘不染
/ yī chén bù rǎn /
Strokes
Definition
untainted by even a speck of dust (idiom); selfless and incorruptible/spotless
Example
佛教
be unstained by an evil environment
Definition
be incorruptible; maintain one's original pure character; remain unaffected
Definition
not soiled by a speck of dust; be spotless clean; be free from dust