SB 10.78.30

asya brahmāsanaṁ dattam
 asmābhir yadu-nandana
āyuś cātmāklamaṁ tāvad
 yāvat satraṁ samāpyate
Synonyms: 
asya — his; brahma-āsanam — the spiritual master’s seat; dattam — given; asmābhiḥ — by us; yadu-nandana — O darling of the Yadus; āyuḥ — long life; ca — and; ātma — bodily; aklamam — freedom from trouble; tāvat — for that long; yāvat — until; satram — the sacrifice; samāpyate — is completed.
Translation: 
“O favorite of the Yadus, we gave him the seat of the spiritual master and promised him long life and freedom from physical pain for as long as this sacrifice continues.
Purport: 

Although Romaharṣaṇa was not a brāhmaṇa, having been born of a mixed marriage, he was invested with that status by the assembled sages and thus given the brahmāsana, the seat of the chief officiating priest.