All śāstric injunctions, as well as the versions of great sages and authorities, establish that a bona fide spiritual master is not necessarily a brāhmaṇa by caste. The only qualification is that he be conversant with the science of Kṛṣṇa, Kṛṣṇa consciousness. That alone makes one perfectly eligible to become a spiritual master.
-Teachings of Lord Caitanya, Chapter 31

सञ्जय उवाच
दृष्ट्वा तु पाण्डवानीकं व्यूढं दुर्योधनस्तदा ।
आचार्यमुपसङ्गम्य राजा वचनमब्रवीत् ॥ २ ॥
Sañjaya said: O King, after looking over the army arranged in military formation by the sons of Pāṇḍu, King Duryodhana went to his teacher and spoke the following words.
-BG 1.2