Kena Upanishad 3.3

तेऽग्निमब्रुवञ्जातवेद एतद्विजानीहि
किमिदं यक्षमिति तथेति ॥ ३॥

te’gnimabruvañjātaveda etadvijānīhi
kimidaṃ yakṣamiti tatheti .. 3..

They addressed Agni; “O Jātaveda, please find out who this yaksha is”; “Yes” said Agni.