Bhagavad Gita Chapter 4.6
ajo ’pi sann avyayatma
bhutanam isvaro ’pi san
prakritim svam adhisthaya
sambhavamy atma-mayaya
Translation
Although I am unborn and My transcendental body never deteriorates, and although I am the Lord of all living entities, I still appear in every millennium in My original transcendental form.