Rig Veda
क्रत्वा॒ हि द्रोणे॑ अ॒ज्यसेऽग्ने॑ वा॒जी न कृत्व्य॑: । परि॑ज्मेव स्व॒धा गयोऽत्यो॒ न ह्वा॒र्यः शिशु॑: ॥ क्रत्वा हि द्रोणे अज्यसेऽग्ने वाजी न कृत्व्यः । परिज्मेव स्वधा गयोऽत्यो न ह्वार्यः शिशुः ॥
You are manifested in the timber, Agni, by the act of attrition; you are the bearer (of the oblation) as a horse (is of his rider); you are like the circumsambient wind; you are food and dwelling; you are like a (newborn) babe, and variable (in movement) as a horse.
english translation