Shvetashvatara Upanishad Verse 2.8
Sanskrit
त्रिरुन्नतं स्थाप्य समं शरीरं हृदीन्द्रियाणि मनसा संनिवेश्य ।
ब्रह्मोडुपेन प्रतरेत विद्वान्स्रोतांसि सर्वाणि भयानकानि ॥ ८॥
Transliteration
trirunnataṃ sthāpya samaṃ śarīraṃ hṛdīndriyāṇi manasā saṃniveśya |
brahmoḍupena pratareta vidvān srotāṃsi sarvāṇi bhayānakāni || 8 ||
Translation
Holding the three parts of the body (chest, neck, and head) erect and steady, and placing the senses and the mind within the heart, the wise man should cross over all the terrifying streams of the world-cycle by means of the boat of Brahman (OM).

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