Matsya Purana — The Greatness of the Vibhūti-Dvādaśī Vow: Pushkara
न गृहीतं ततस्ताभ्यां बहुसत्त्वावलम्बनात् अनङ्गवत्या च पुनस् तयोरन्नं चतुर्विधम् आनीय व्याहृतं चात्र भुज्यतामिति भूपते //
na gṛhītaṃ tatastābhyāṃ bahusattvāvalambanāt anaṅgavatyā ca punas tayorannaṃ caturvidham ānīya vyāhṛtaṃ cātra bhujyatāmiti bhūpate //
Therefore the two did not accept it, for it depended upon (the harm of) many living beings. Then Anaṅgavatī again brought four kinds of food for them and said, “O King, let it be eaten here.”
This verse does not discuss Pralaya; it emphasizes ethical discernment in daily life—especially refusing food connected with harm to many creatures.
It highlights atithi-dharma and ahiṃsā: a ruler/householder should offer guests suitable food, and the righteous may refuse offerings that depend on injury to many beings; the host should then provide acceptable alternatives.
No Vāstu or temple-architecture rule appears here; the ritual takeaway is ethical purity in offerings—food should be fit to eat and not grounded in widespread harm to living creatures.