Chapter 3 · The Yoga of Action · Krishna said
Bhagavad Gita 3.41 — First control the senses
तस्मात्त्वमिन्द्रियाण्यादौ नियम्य भरतर्षभ। पाप्मानं प्रजहि ह्येनं ज्ञानविज्ञाननाशनम् ॥
tasmāttvamindriyāṇyādau niyamya bharatarṣabha | pāpmānaṃ prajahi hyenaṃ jñānavijñānanāśanam ||
Meaning
So, best of the Bharatas, first control your senses and then destroy this sinful thing that ruins knowledge and wisdom.