Bhagavad Gita 3.41

3.41 Therefore, O best of the Bharatas (Arjuna), controlling the senses first, do thou kill this sinful thing, the destroyer of knowledge and realisation.

Therefore, O Arjuna, best of the Bhāratas, in the very beginning curb this great symbol of sin [lust] by regulating the senses, and slay this destroyer of knowledge and self-realization.