Charak Samhita
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नियतस्त्वनुबन्धो रजस्तमसोः परस्परं, न ह्यरजस्कं तमः प्रवर्तते ॥९॥
[Psychic doshas- their eternal union] There is an eternal union between the two dosha pertaining to mind, viz. rajas and tamas. Tamas cannot manifest its actions without rajas.
english translation
Chapter 6
Verse 8
Verse 10