Rig Veda
अव॑ स्म॒ यस्य॒ वेष॑णे॒ स्वेदं॑ प॒थिषु॒ जुह्व॑ति । अ॒भीमह॒ स्वजे॑न्यं॒ भूमा॑ पृ॒ष्ठेव॑ रुरुहुः ॥ अव स्म यस्य वेषणे स्वेदं पथिषु जुह्वति । अभीमह स्वजेन्यं भूमा पृष्ठेव रुरुहुः ॥
At whose worship (the priests) pour the dripping (butter) upon the flames, and (the drops) mount upon the fire as if they were its own numerous offspring, as (boys ride) upon the back (of a father).
english translation