Your good self is one of the eternal associates of the Supreme Personality of Godhead for whose sake the Lord, while going back to His abode, left instructions with me.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
भवान्भगवतो नित्यं सम्मतः सानुगस्य ह । यस्य ज्ञानोपदेशाय मादिशद्भगवान् व्रजन्
bhavānbhagavato nityaṃ sammataḥ sānugasya ha | yasya jñānopadeśāya mādiśadbhagavān vrajan
SB 3.5.21