Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 8 · Marriage
विवाहः
पंचांगमस्य शुद्धिस्तु पंचांगशुद्धिरीरिता ।यस्मिन्पंचांगदोषोऽस्ति तस्मिँल्लग्ने निरर्थकम् ॥ ४४० ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 440.
is the panchanga (almanac). Its purity is called panchanga purity. A lagna (rising sign) with a panchanga fault is worthless.
Simple meaning: A lagna with a fault in any almanac part is worth nothing.
त्यजेत्पंचैष्टिकं चापि विषसंयुक्तदुग्धवत् ।
Drop the five-fold fault. The lagna and its navamsha should be seen or joined by their own lords.
न चेद्वान्योन्यपतिना शुभमित्रेण वा तथा ।
If no lord or friendly planet sees the lagna and navamsha, the groom's life may be at risk.
एवं तौ न युतौ दृष्टौ मुत्युर्वध्वाः करग्रहे ।
If the 7ths get no help, the bride's life may be at risk at marriage. Avoid the Sun's crossing.