Srimad Bhagavatam Canto 10, Chapter 51, Text 36

SB 10.51.36

sri-bhagavan uvaca
janma-karmabhidhanani
 santi me ’nga sahasrasah
na sakyante ’nusankhyatum
 anantatvan mayapi hi
 
Translation: 
 
The Supreme Lord said: My dear friend, I have taken thousands of births, lived thousands of lives and accepted thousands of names. In fact My births, activities and names are limitless, and thus even I cannot count them.
Srimad Bhagavatam Canto 10, Chapter 51, Text 35
Srimad Bhagavatam Canto 10, Chapter 51, Text 37