Bhagavad Gita 3.7
But, O Arjuna! All honor to him whose mind controls his senses, for he is thereby beginning to practice Karma-Yoga, the Path of Right Action, keeping himself always unattached.
यस्त्विन्द्रियाणि मनसा नियम्यारभतेऽर्जुन।
कर्मेन्द्रियैः कर्मयोगमसक्तः स विशिष्यते॥yastvindriyāṇi manasā niyamyārabhate'rjuna|
karmendriyaiḥ karmayogamasaktaḥ sa viśiṣyate||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).