Answering the prayer of Lord Brahmā, I descended within this world along with My plenary portion, Lord Baladeva, and performed various activities on behalf of the demigods. I have now completed My mission here.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
मया निष्पादितं ह्यत्र देवकार्यमशेषतः । यदर्थमवतीर्णोऽहमंशेन ब्रह्मणार्थितः
mayā niṣpāditaṃ hyatra devakāryamaśeṣataḥ | yadarthamavatīrṇo'hamaṃśena brahmaṇārthitaḥ
SB 11.7.2