Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 8 · Marriage
विवाहः
पापग्रहयुतश्चंद्रः करोति मरणं तयोः ।दंपत्योरष्टमं लग्नमष्टमो राशिरेव च ॥ ४६० ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 460.
The Moon joined with bad planets may put the lives of the two at risk. Now take the 8th from the couple's lagna (rising sign), and the 8th from their sign.
Simple meaning: The Moon with bad planets may put the couple's life at risk. The 8th from their lagna and sign comes next.
यदि लग्नगतः सोपि दंपत्योर्मरणप्रदः ।
If the 8th sign from theirs rises at the wedding, it may put the couple's life at risk.
लग्नं विवर्जयेद्यत्नात्तदंशांशतदीश्वराम् ।
Avoid that lagna, its navamsha and their lords. The 12th from their lagna or sign rising is next.
अर्थहानिस्तयोरस्मात्तदंशस्वामिनं त्यजेत् ।
That may bring loss of wealth, so leave out its navamsha lord too. The birth sign and birth lagna rising are good.