Śatapatha Brāhmaṇa ("of a hundred paths") 1.4.5.11

1.4.5.11

te prajāpatiṃ pratipraśnameyatuḥ | sa prajāpatirmanasa evānūvāca mana eva tvacreyo manaso vai tvaṃ kṛtānukarānuvartmāsi śreyaso vai pāpīyāṅkṛtānukaro 'nuvartmā bhavatīti

They went to appeal to Pragâpati for his decision. He, Pragâpati, decided in favour of Mind, saying (to Speech), 'Mind is indeed better than thou, for thou art an imitator of its deeds and a follower in its wake; and inferior, surely, is he who imitates his better's deeds and follows in his wake.'