In Gita Chapter 4 Verse 32,
it has been clarified that Sachidanand Ghan Brahm has Himself described in detail the knowledge of yagyas,
that is, religious rituals in the speech uttered from His lotus-mouth. It is Tatvgyan.
Then immediately in Gita Chapter 8 Verses 8, 9, 10, the Giver of the knowledge of Gita has stated that-
He who worships‘Tat Brahm' i.e.‘Param Akshar Brahm' attains that Sachidanand Ghan Brahm, that is, he will attain the divine Supreme God other than me.
Even in Gita Chapter 4 Verse 32,
it has been stated that the(BrahmnH Mukhe) Sachidanand Ghan Brahm i.e. Param Akshar
Brahm uttered the information about the yagyas i.e. religious rituals from his lotus-mouth. He has spoken about it in detail in his speech. It is Tatvgyan.