Śatapatha Brāhmaṇa ("of a hundred paths") 13.4.4.10

13.4.4.10

māṃsebhya evāsya palāśaḥ samabhavat tasmātsa bahuraso lohitaraso lohitamiva hi māṃsaṃ tenaivainaṃ tadrūpeṇa samardhayatyantare khādirā bhavanti bāhye pālāśa antarāṇi hyasthīni bāhyāni māṃsāni sva evaināṃstadāyatane dadhāti

From his flesh the palâsa was produced, whence that (tree) has much juice, and (that) red juice, for red, as it were, is flesh: with that quality he thus endows it. The khadira (stakes) are inside, and the palâsa ones outside, for inside are the bones, and outside is the flesh: he thus puts them in their own place.