Hawzah News Agency – The commander of the faithful, Imam Ali peace be upon him says:

مُجالَسَةُ الأشرارِ تُورِثُ سُوءَ الظَّنِّ بِالأخيارِ.

 ‘Sitting in the company of bad people engenders suspicious thoughts about good people.’

Source: Bihar al-Anwar, v. 74, p. 197, no. 31