Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · War Astrology: Yogas, Nakshatras
युद्धजयार्णवः (योगाः नक्षत्राणि)
देवैर्जिता दानवाश्च येनोपायेन तद्वद ।शुभाशुभविवेकाद्यं ज्ञानं युद्धजयार्णवम् ॥ २ ॥
In the full Agni Purana this is chapter 124, verse 2.
Tell me the means by which the gods defeated the demons. The knowledge that begins with telling good from bad is the Yuddhajayarnava.
Simple meaning: Uma asks how the gods beat the demons. The knowledge of good and bad signs is the Yuddhajayarnava.
मूलदेवेच्छया जाता शक्तिः पञ्चदशाक्षरा ।
From the first god's will came a fifteen-syllable power, and from her the world. Worshipping her gives all knowledge.
मन्त्रपीठं प्रवक्ष्यामि पञ्चपन्त्रसमुद्भवम् ।
The seat of mantras comes from five mantras, which hold the life and death of all mantras.
ऋग्यजुःसामाथर्वाख्यवेदमन्त्राः क्रमेण ते ।
The five mantras match the four Vedas and Sadyojata and the others, with Brahma, Vishnu and Rudra.