Matsya Purana — Navagraha Sacrifice for Planetary Pacification and Prosperity
अश्वमेधसहस्राणि दश चाष्टौ च धर्मवित् कृत्वा यत्फलमाप्नोति कौटिहोमात् तदश्नुते //
aśvamedhasahasrāṇi daśa cāṣṭau ca dharmavit kṛtvā yatphalamāpnoti kauṭihomāt tadaśnute //
A knower of dharma attains from the Kauṭi-homa that very fruit which one would obtain by performing one thousand Aśvamedha sacrifices—and also ten and eight more, that is, eighteen additional Aśvamedhas.
This verse does not address Pralaya; it focuses on ritual equivalence, stating that the Kauṭi-homa yields merit comparable to an immense number of Aśvamedha sacrifices.
It frames an accessible dharmic path to great religious merit: instead of undertaking many costly royal Aśvamedhas, a practitioner devoted to dharma may pursue a powerful homa-based rite (Kauṭi-homa) to gain comparable spiritual fruit.
The ritual significance is central: the text elevates the Kauṭi-homa as a high-potency oblation rite whose phala (reward) is declared equivalent to performing 1000 plus 18 Aśvamedhas.