Matsya Purana — Inquiry into Yayāti’s Story and the Kacha–Devayānī Episode
अथ देवा भयोद्विग्नाः काव्यादुशनसस्तदा ऊचुः कचमुपागम्य ज्येष्ठं पुत्रं बृहस्पतेः //
atha devā bhayodvignāḥ kāvyāduśanasastadā ūcuḥ kacamupāgamya jyeṣṭhaṃ putraṃ bṛhaspateḥ //
Then the gods, shaken with fear, approached Kaca, the eldest son of Bṛhaspati, and spoke to him of the danger arising from Kāvya Uśanas (Śukra).
This verse is not about Pralaya; it introduces a Deva–Asura episode where the gods, fearful of Śukra’s power, seek help from Kacha.
Indirectly, it highlights a dharmic strategy: when threatened, one seeks counsel from qualified authorities (a principle relevant to rulers and householders—consulting competent advisers rather than acting rashly).
No Vāstu or temple-ritual rule is stated in this verse; its focus is on approaching a guru-line figure (Kacha) in a crisis, a common Purāṇic setup for later transmission of sacred knowledge.