SB 11.26.3
sangam na kuryad asatam
sisnodara-trpam kvacit
tasyanugas tamasy andhe
pataty andhanugandha-vat
Translation:
One should never associate with materialists, those dedicated to gratifying their genitals and bellies. By following them one falls into the deepest pit of darkness, just like a blind man who follows another blind man.