SB 10.81.39
tasya vai deva-devasya
harer yajña-pateh prabhoh
brahmanah prabhavo daivam
na tebhyo vidyate param
Translation:
Lord Hari is the God of all gods, the master of all sacrifices, and the supreme ruler. But He accepts the saintly brahmanas as His masters, and so there exists no deity higher than them.
Purport:
Srila Visvanatha Cakravarti points out that even though Sri Krsna is the supreme ruler of creation, He accepts the brahmanas as His masters; even though He is the God of all gods, the brahmanas are His deities; and even though He is the Lord of all sacrifices, He performs sacrifices to worship them.