Bhagavad Gita 18.33

धृत्या यया धारयते मनःप्राणेन्द्रियक्रियाः।योगेनाव्यभिचारिण्या धृतिः सा पार्थ सात्त्विकी ॥१८.३३॥

dhṛtyā yayā dhārayate manaḥprāṇendriyakriyāḥyogenāvyabhicāriṇyā dhṛtiḥ sā pārtha sāttvikī

The unwavering firmness, through which Yoga restrains the functions of the mind, life-force, and senses—that firmness, O Arjuna, is Sattvic (pure).

गीता