From the mouth of the Person brahma turned forth, and because he faced the front the brahmana became chief and teacher among the varnas: 'mukhato avartata brahma puruShasya kurUdvaha / yastUn mukhatvAd varNAnAM mukhyo abhUd brAhmaNo guruH' (SB 3.6.30).
Brahmanas
ब्राह्मण
The brahmanas are the varna arisen from the mouth of the Person. At SB 3.6.30: 'mukhato avartata brahma puruShasya kurUdvaha / yastUn mukhatvAd varNAnAM mukhyo abhUd brAhmaNo guruH' — from the Person's mouth brahma turned forth, and because he faced the front the brahmana became chief and teacher among the varnas. At SB 3.6.34 all four varnas are described as worshipping Hari, their own teacher, each by his own dharma, with faith, for the purification of the self.
Śrīmad Bhāgavata Mahāpurāṇa 3.6.30 — Sanskrit Wikisource (pinned chapter page; Devanagari from the cross-validated transcription in validation/sanskrit_skandha3.json)