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SB 11.26.3

saṅgaṁ na kuryād asatāṁ
 śiśnodara-tṛpāṁ kvacit
tasyānugas tamasy andhe
 pataty andhānugāndha-vat
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.
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.