Bhagavad Gita 8.12

सर्वद्वाराणि संयम्य मनो हृदि निरुध्य च।मूर्ध्न्याधायात्मनः प्राणमास्थितो योगधारणाम्॥

sarvadvārāṇi saṃyamya mano hṛdi nirudhya ca |mūrdhnyādhāyātmanaḥ prāṇamāsthito yogadhāraṇām ||

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.

Closing the gates of the body, drawing the forces of his mind into the heart, and, by the power of meditation, concentrating his vital energy in the brain;

Our plain-language meaning of this verse is waiting for scholar review.