एष ह वै यज्ञो योऽयं पवते एष ह यन्निदँ सर्वं पुनाति यदेष यन्निदँ सर्वं पुनाति तस्मादेष एव यज्ञस्तस्य मनश्च वाक्च वर्तनी ॥ १ ॥
In plain words
This blowing wind is truly the sacrifice. Because it purifies everything here, it alone is the sacrifice. Mind and speech are its two paths.
Close to the Sanskrit
This indeed certainly is the sacrifice, which this blows; this indeed because this purifies all this, because this purifies all this, therefore this alone is the sacrifice. Of that, the mind and speech are the two paths.