Aitareyabrahmana 7.25

7.25

athāto dīkṣāyā āvedanasyaiva.
tad āhur:
yad brāhmaṇasya dīkṣitasya brāhmaṇo 'dīkṣiṣṭeti dīkṣām āvedayanti,
kathaṃ kṣatriyasyāvedayed iti
yathaivaitad brāhmaṇasya dīkṣitasya:
brāhmaṇo 'dīkṣiṣṭeti dīkṣām avedayanty,
evam evaitat kṣatriyasyāvedayet, purohitasyārṣeyeṇeti
tat-tad itī+m̐ \
nidhāya vā eṣa svāny āyudhāni brahmāṇa evāyudhair
brahmaṇo rūpeṇā brahma bhūtvā yajñam upāvartata.
tasmāt tasya purohitasyārṣeyeṇa dīkṣām āvedayeyuḥ,
purohitasyārṣeyeṇa pravaram pravṛṇīran

vii. 25 (xxxiv. 7). Then as to the announcement of the consecration. They say 'Seeing that they announce the consecration of a Brahman when consecrated with "The Brahman hath consecrated himself", how is one to announce (the consecration) of a Kṣatriya?' 'As in the case of a Brahman when consecrated they announce the consecration with "The Brahman hath consecrated himself", so should he announce (the consecration) of a Kṣatriya, with the Ṛṣi descent of his Purohita' (they say); 'Thus, thus' (they say). Having laid aside his own weapons, with the weapons of the holy power, with the form of the holy power, having become the holy power, he resorted to the sacrifice. Therefore should they announce his consecration with the Ṛṣi descent of his Purohita; with the Ṛṣi descent of the Purohita they should perform the ancestral invocation.