Brihat Samhita
स्निग्धौ सुभिक्षशिवदावथाधिकं दृश्यते कनामा यः । दश वर्षाण्युपतापं जनयति शस्त्रप्रकोपकृतम् ॥ ११-३८ ॥
If both should appear glossy, there will be prosperity and happiness in the land; if the Ka Ketu should be visible for over 7 days, there will be much suffering from wars for ten years.
english translation
snigdhau subhikSazivadAvathAdhikaM dRzyate kanAmA yaH । daza varSANyupatApaM janayati zastraprakopakRtam ॥ 11-38 ॥
hk transliteration by Sanscript