Śatapatha Brāhmaṇa ("of a hundred paths") 7.5.1.3

7.5.1.3

tamabhyanakti | dadhnā madhunā ghṛtena dadhi haivāsya lokasya rūpaṃ ghṛtamantarikṣasya madhvamuṣya svenaivainametadrūpeṇa samardhayatyatho dadhi haivāsya lokasya raso ghṛtamantarikṣasya madhvamuṣya svenaivainametadrasena samardhayati

He anoints it with sour curds, honey, and ghee,--sour curds doubtless are a form of this (earth-)world, ghee of the air, and honey of yonder sky: he thus supplies it (the tortoise) with its own form. Or, sour curds are the life-sap of this (earth-)world, ghee that of the air, and honey that of yonder sky: he thus supplies it with its own life-sap.