Just like we belong to the Brahma-sampradāya. There are four sampradāyas, Brahma-sampradāya, Śrī-sampradāya, Rudra-sampradāya and Kumāra-samapradāya. They're all mahājanas. Mahājano yena gataḥ sa panthāḥ (CC Madhya 17.186). We have to accept the line of action which is given by the mahājana.
So Brahmā is mahājana. You'll find Brahmā's picture with Veda in his hand. So he's the, he gave the first instruction of Veda. But wherefrom he got the Vedic knowledge? Therefore Vedic knowledge is apauruṣeya. It is not man-made. It is God-made. Dharmaṁ tu sākṣād bhagavat-praṇītam (SB 6.3.19). So how God, Kṛṣṇa gave to Brahmā? Tene brahma hṛdā. Brahma, brahma means the Vedic knowledge. Śabda-brahma. Tene. He injected Vedic knowledge from hṛdā. Teṣāṁ satata-yuktānāṁ bhajatāṁ pritī-pūrvakam (BG 10.10). When Brahmā was created, he was perplexed: "What is my duty? Everything is dark." So he meditated, and Kṛṣṇa gave him knowledge that: "Your duty is this. You do like this." Tene brahma hṛdā ya ādi-kavaye. Ādi-kavaye (SB 1.1.1). Brahmā is ādi-kavaye. So actual guru is Kṛṣṇa. And here is... Kṛṣṇa is advising the Bhagavad-gītā. These rascals and fools will not accept Kṛṣṇa as guru. They'll go to some rascal and fool and miscreants, sinful person, and accept guru. How he can be guru?