Mahabharata 6.30.12

सर्वद्वाराणि संयम्य मनो हृदि निरुध्य चमूर्ध्न्याधायात्मनः प्राणमास्थितो योगधारणाम्

sarvadvārāṇi saṃyamya mano hṛdi nirudhya camūrdhnyādhāyātmanaḥ prāṇamāsthito yogadhāraṇām

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