Srimad-Bhagavatam: Canto 6 - Chapter 1 - Verse 49

Sanskrit:

नोच्छिष्टं चण्डिकान्नं च सामिषं वृषलाहृतम् ।भुञ्जीतोदक्यया द‍ृष्टं पिबेन्नाञ्जलिना त्वप: ॥ ४९ ॥

ITRANS:

nocchiṣṭaṁ caṇḍikānnaṁ casāmiṣaṁ vṛṣalāhṛtambhuñjītodakyayā dṛṣṭaṁpiben nāñjalinā tv apaḥ

Translation:

Never eat leftover food, never eat prasāda offered to the goddess Kālī [Durgā], and do not eat anything contaminated by flesh or fish. Do not eat anything brought or touched by a śūdra nor anything seen by a woman in her menstrual period. Do not drink water by joining your palms.

Purport:

Generally the goddess Kālī is offered food containing meat and fish, and therefore Kaśyapa Muni strictly forbade his wife to take the remnants of such food. Actually a Vaiṣṇava is not allowed to take any food offered to the demigods. A Vaiṣṇava is always fixed in accepting prasāda offered to Lord Viṣṇu. Through all these instructions, Kaśyapa Muni, in a negative way, instructed his wife Diti how to become a Vaiṣṇavī.