Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 8 · Marriage
विवाहः
भृगुषष्ठाह्वयो दोषो लग्नात्षष्ठगते सिते ।उच्चगे शुभसंयुक्ते तल्लग्नं सर्वदा त्यजेत् ॥ ४४५ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 445.
The fault called Bhrigu-shashtha: Venus is in the 6th from the lagna (rising sign). Even if Venus is high and joined by good planets, always drop that lagna.
Simple meaning: Never use a lagna with Venus in the 6th, even if Venus is strong.
कुजोऽष्टमो महादोषो लग्नादष्टमगे कुजे ।
Mars in the 8th spoils a lagna, unless Mars is high and three good planets join the lagna.
पूर्णानंदाख्ययोस्तिथ्योः संधिर्नाडीद्वयं यदा ।
The meeting of Purna and Nanda moon days, two ghatikas long, is a risky junction for birth and marriage.
कुलीरसिंहयोः कीटचापयोर्मीनमेषयोः ।
The gap between those pairs of signs is a risky junction for half a ghatika.