Like a muddied spring or a polluted fountain is a righteous man who gives way before the wicked.
Proverbs 25:26 ESV

A muddied spring needs to be thoroughly filtered and sanitized before its water can be drunk. A polluted fountain is a source of disease. A righteous man should be a source of life to his family and community. If he allows the wicked to have their way, he might as well be a wicked man himself.