Śatapatha Brāhmaṇa ("of a hundred paths") 5.3.2.5

5.3.2.5

tasyāvṛt | yā svayampraśīrṇāśvatthī śākhā prācī vodīcī vā bhavati tasyai maitram pātraṃ karoti varuṇyā vā eṣā yā paraśuvṛkṇāthaiṣā maitrī yā svayampraśīrṇā tasmātsvayampraśīrṇāyai śākhāyai maitram pātraṃ karoti

The course of this (is as follows). Any asvattha branch broken off by itself, either on the eastern or on the northern side (of the tree), from that he makes a vessel (to hold the pap) for Mitra; for that which is hewn by the axe belongs to Varuna; but that which is broken off by itself belongs to Mitra: therefore he makes the vessel for Mitra from a branch broken off by itself.