नाभिस्थानस् च़ित् ज़लव॑ञी,ब्रह्मस्थानस् शिशिरुनु् मुख् ।ब्रह्माण्डस् छ्यय् नद् वहव॑ञी,तवय् तरुनु् हूह् हाह् गौव् त॑तु् ॥ ५७ ॥
In plain words
At the navel, fire burns; at the place of Brahman is the source of coolness; in the brahmāṇḍa, a river is flowing. That is why hūh is cold and hāh is hot.