Bhagavad Gita · 14.10

रजस्तमश्चाभिभूय सत्त्वं भवति भारत।रजः सत्त्वं तमश्चैव तमः सत्त्वं रजस्तथा॥

rajas tamaśh chābhibhūya sattvaṁ bhavati bhārata rajaḥ sattvaṁ tamaśh chaiva tamaḥ sattvaṁ rajas tathā

Sometimes sattva prevails over rajas and tamas; sometimes rajas prevails over sattva and tamas; and at other times tamas prevails over sattva and rajas, O Arjuna.

— Bhagavad Gita 14.10

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)