KAṬHA UPANISHAD · 2.2.3

ऊर्ध्वं प्राणमुन्नयत्यपानं प्रत्यगस्यति ।
मध्ये वामनमासीनं विश्वे देवा उपासते ॥ ३॥

ūrdhvaṃ prāṇamunnayatyapānaṃ pratyagasyati ।
madhye vāmanamāsīnaṃ viśve devā upāsate ॥ 3॥

This is He that draweth the main breath upward and casteth the lower breath downward. The Dwarf that sitteth in the centre, to Him all the Gods do homage.