 छिद्रं हि मृगयन्तेऽत्र विद्वांसो ब्रह्मराक्षसा: ।निहतस्य च यज्ञस्य सद्य: कर्ता विनश्यति ।।  
 The learned brahmarakshasas always look out for flaws in the sacrifice so that they can spoil it. If a flaw finds place, the doer of the sacrifice is immediately destroyed. 