Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · War Astrology: Yogas, Nakshatras
युद्धजयार्णवः (योगाः नक्षत्राणि)
पञ्चोदयं प्रवक्ष्यामि स्वरोदयसमाश्रितम् ।नाभिहृदन्तरं यावत्तावच्चरति मारुतः ॥ ३ ॥
In the full Agni Purana this is chapter 125, verse 3.
I will tell the five risings, resting on svarodaya (the reading of the breath's rising). As far as the space between the navel and the heart, so far the wind moves.
Simple meaning: The five risings are told, based on the breath. The wind moves between the navel and the heart.
ब्रह्माण्डेन कपालेन पिबेत परमामृतम् ।
By the strength of the five letter groups there is victory in battle.
अआकचटतपयाः श आद्यो वर्ग ईरितः ।
The first two letter groups, nine letters each, are named here.
उऊगजडदबलाः सो वर्गश्च तृतीयकः ।
The third and fourth letter groups, nine letters each, are named here.