Śatapatha Brāhmaṇa ("of a hundred paths") 11.4.1.3

11.4.1.3

te hocuḥ svaidāyana tvayā vīreṇemam pratisaṃyatāmahā iti sa hovācopātra khalu ramatāhaṃ nvenaṃ vedānīti taṃ hābhiprapede taṃ hābhiprapannamabhyuvāda svaidāyanā3 iti ho3 gautamasya putretītaraḥ pratiśuśrāva taṃ ha tata eva praṣṭuṃ dadhre

They said, 'Svaidâyana, with thee as our champion we will fight this fellow.' He said, 'Well, then, stay ye here quietly: I will just make his acquaintance.' He went up to him, and when he had come up, he (Uddâlaka) greeted him saying, 'Svaidâyana!'--'Halloo, son of Gautama!' replied the other, and straightway, began to question him.