Chapter 8 · verse 12 · gita.yoga.org

Bhagavad Gita 8.12

सर्वद्वाराणि संयम्य मनो हृदि निरुध्य च। मूर्ध्न्याधायात्मनः प्राणमास्थितो योगधारणाम्

Having closed all the gates, confined the mind in the heart, and fixed the life-breath in the head, engage in the practice of concentration.