Śatapatha Brāhmaṇa ("of a hundred paths") 3.6.2.12

3.6.2.12

khadireṇa ha somamācakhāda | tasmātkhadiro yadenenākhidattasmātkhādiro yūpo bhavati khādira sphyo 'cāvākasya hainaṃ gopanāyāṃ jahāra so 'cāvāko 'hīyata

She took possession (â-kakhâda) of Soma by means of (a stick of) khadira wood (Acacia Catechu), whence (the name) Khadira; and because she thereby took possession of him, therefore the sacrificial stake and the wooden sword (sphya) are of khadira wood.
She then carried him off while he was under the charge of the Akhâvâka, wherefore this Akhâvâka priest was excluded (from drinking Soma).