Verse 4

नभोगतलतापत्रसंस्थितेनान्तरात्मना ।सर्वाः स्वमनसा तेन कृता यज्ञक्रियाः क्रमात्

In plain words

with his inner self stationed upon a creeper-leaf risen into the sky, all the sacrificial rites were performed by him, in due order, with his own mind.