Chapter 8 · The Imperishable Absolute · Krishna said
Bhagavad Gita 8.12 — Yogic concentration
सर्वद्वाराणि संयम्य मनो हृदि निरुध्य च। मूध्न्यार्धायात्मनः प्राणमास्थितो योगधारणाम् ॥
sarvadvārāṇi saṃyamya mano hṛdi nirudhya ca | mūdhnyā^^rdhāyātmanaḥ prāṇamāsthito yogadhāraṇām ||
Meaning
Closing all the gates of the body, holding the mind in the heart, drawing the life-breath up into the head, and established in yogic concentration —