Brihat Parashara Hora Shastra
स्वराशौ संस्थितेऽप्येवं नित्याख्ये दारकारके । उत्तरायुषि निर्दारो भवत्येव न संशयः ॥ १३॥
Wife from the 2nd of Upa Pad (up to Sloka 22). If a Grah being constant indicator of wife (i.e. the 7th Lord, or Śukr) is in its own Bhava, there will be loss of wife only at a later stage.
english translation
svarAzau saMsthite'pyevaM nityAkhye dArakArake । uttarAyuSi nirdAro bhavatyeva na saMzayaH ॥ 13॥
hk transliteration by Sanscript