Śatapatha Brāhmaṇa ("of a hundred paths") 2.6.1.38

2.6.1.38

aindrībhyāmāhavanīyamupatiṣṭhante indro hyāhavanīyo 'kṣannamīmadanta hyava priyā adhūṣata astoṣata svabhānavo viprā naviṣṭhayā matī yojā nvindra te hari susaṃdṛśaṃ tvā vayam maghavanvandiṣīmahi pra nūnam pūrṇabandhura stuto yāsi vaśāṃ 'anu yojā nvindra te harī iti

They stand by the Âhavanîya fire (worshipping) with two (verses) addressed to Indra [viz. Rig-veda I, 82, 2-3; Vâg. S. III, 51-52], since the Âhavanîya is Indra. 'The friends have eaten, and regaled themselves, and have shaken off (the enemies); the self-shining bards have extolled (thee) with their newest hymn: yoke, then, thy pair of bay steeds, O Indra!--To thee, the splendid, we will sing praises, O bountiful one! Thus praised, do thou now issue forth, with well-filled car, agreeably to our desire! yoke, then, thy pair of bay steeds, O Indra!'