Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · War Astrology: Yogas, Nakshatras
युद्धजयार्णवः (योगाः नक्षत्राणि)
द्वितीया द्वादशी चैव सप्तमी वै तृतीयया ।रविर्भौमस्तथा सौरिः षडेतास्तु(ते तु) त्रिपुष्कराः ॥
In the full Agni Purana this is chapter 126, verse 24.
The 2nd, the 12th and, as the third, the 7th moon day. The Sun, Mars and Saturn as weekdays. These six make Tripushkara.
Simple meaning: The 2nd, 7th and 12th moon days, with Sunday, Tuesday or Saturday, make Tripushkara, a three-fold result.
विशाखा कृत्तिका चैव उत्तरे द्वे पुनर्वसुः ।
Six nakshatras make Tripushkara: Vishakha, Krittika, two Uttaras, Punarvasu and Purva Bhadrapada.
लाभो हानिर्जयो वृद्धिः पुत्रजन्म तथैव च ।
In that combination, gains, losses, wins and a son's birth all come three times over.
अश्विनी भरणी चैव अश्लेषा पुष्यमेव च ।
A list of seven nakshatras: Ashvini, Bharani, Ashlesha, Pushya, Swati, Vishakha and Shravana.