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SB 11.26.3

saṅgaṁ na kuryād asatāṁ
 śiśnodara-tṛpāṁ kvacit
tasyānugas tamasy andhe
 pataty andhānugāndha-vat
Synonyms: 
saṅgam — association; na kuryāt — one should never make; asatām — of those who are materialistic; śiśna — the genitals; udara — and the belly; tṛpām — who are devoted to gratifying; kvacit — at any time; tasya — of any such person; anugaḥ — the follower; tamasi andhe — into the darkest pit; patati — he falls; andha-anuga — following a blind man; andha-vat — just like another blind man.
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.