Strong H2141 זָכַךְ zâkak · be clean

Job

1. Job 9:30
   If I wash myself with snow water, and make my hands never so clean;
2. Job 15:15
   Behold, he putteth no trust in his saints; yea, the heavens are not clean in his sight.
3. Job 25:5
   Behold even to the moon, and it shineth not; yea, the stars are not pure in his sight.