Sri Narada Muni said: After first offering my obeisances unto Lord Krsna, the protector of the religious principles of all living entities, let me explain the principles of the eternal religious system, of which I have heard from the mouth of Narayana

Expressions researched:
"Sri Narada Muni said: After first offering my obeisances unto Lord Krsna, the protector of the religious principles of all living entities, let me explain the principles of the eternal religious system, of which I have heard from the mouth of Narayana"

Srimad-Bhagavatam

SB Canto 7

Sri Narada Muni said: After first offering my obeisances unto Lord Krsna, the protector of the religious principles of all living entities, let me explain the principles of the eternal religious system, of which I have heard from the mouth of Narayana.

SB 7.11.5, Translation and Purport

Sri Narada Muni said: After first offering my obeisances unto Lord Krsna, the protector of the religious principles of all living entities, let me explain the principles of the eternal religious system, of which I have heard from the mouth of Narayana.

The word aja refers to Kṛṣṇa, who explains in Bhagavad-gītā (BG 4.6), ajo 'pi sann avyayātmā: "I am ever existing, and thus I never take birth. There is no change in My existence."