Śatapatha Brāhmaṇa ("of a hundred paths") 6.2.1.1

6.2.1.1

prajāpatiragnirūpāṇyabhyadhyāyat | sa yo 'yaṃ kumāro rūpāṇyanupraviṣṭa āsīttamanvaicatso 'gniravedanu vai mā pitā prajāpatiricati hanta tadrūpamasāni yanma eṣa na vedeti

Pragâpati set his mind upon Agni's forms. He searched for that boy (Kumâra) who had entered into the (different) forms. Agni became aware of it,--'Surely, Father Pragâpati is searching for me: well then, let me be suchlike that he knows me not.'