तस्मै दत्वा तदा सिद्धं सर्वं विप्राय निश्चितः । निश्शेषितेन्ने भगवान् अभुक्त्वैव महातपाः ॥

— श्रीमद्वाल्मीकिरामायणे बालकाण्डे पञ्चषष्टितमस्सर्गः (६) After completing 1000 years of severe Vratam (tapas), without taking food, water, and even air, Vishwaamitra prepared सिद्धान्नम् (cooked food as per shaastras, performed naivedyam to God and prepared the food for consumption). In order to complete the Vratam, he was about to eat this सिद्धान्नम्. Then, in order to test…

छिद्रं हि मृगयन्तेऽत्र विद्वांसो ब्रह्मराक्षसाः । निहतस्य च यज्ञस्य सद्यः कर्ता विनश्यति ॥

— श्रीमद्वाल्मीकिरामायणे बालकाण्डे अष्टमस्सर्गः (१७) तथा द्वादशस्सर्गः (१७) While ordering his ministers to carefully make all arrangements for यज्ञ, दशरथ says this श्लोकम् (infact twice – in 8th as well as 12th सर्गः). He says ब्रह्मराक्षसाः will be looking for even the slightest of faults one commits during यज्ञ and then taking them as opportunity will destroy the यज्ञ. Once…