Bhagavad Gita · 3.7

यस्त्विन्द्रियाणि मनसा नियम्यारभतेऽर्जुन।कर्मेन्द्रियैः कर्मयोगमसक्तः स विशिष्यते॥

yas tv indriyāṇi manasā niyamyārabhate 'rjuna karmendriyaiḥ karma-yogam asaktaḥ sa viśhiṣhyate

But one who controls the senses with the mind and engages the organs of action in the path of selfless work, without attachment — that person excels.

— Bhagavad Gita 3.7

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