Shatapatha Brahmana 1.1.4.18

1.1.4.18

sa samāhanti | kukkuṭo 'si madhujihva iti madhujihvo vai sa devebhya āsīdviṣajihvo 'surebhyaḥ sa yo devebhya āsīḥ sana edhītye vaitadāheṣamūrjamāvada tvayā vayaṃ saṅghātaṃ saṅghātaṃ jeṣmeti nātra tirohitamivāsti

He beats the mill-stones with the wedge, with the text (Vâg. S. I, 16 a): 'A honey-tongued cock (kukkuta) art thou (O wedge)!' For honey-tongued indeed was he (the bull) for the gods, and poison-tongued for the Asuras: hence he thereby says: 'What thou wert for the gods, that be thou for us!' He adds: 'Sap and strength do thou call hither! with thy help may we conquer in every battle!' In these words there is nothing that is obscure.