4:5  

श्रीभगवानुवाच
बहूनि मे व्यतीतानि जन्मानि तव चार्जुन ।
तान्यहं वेद सर्वाणि न त्वं वेत्थ परन्तप ॥४-५॥

shriibhagawaanuwaacha

bahooni me wyatiitaani janmaani tawa chaarjuna ।

taanyahaM weda sarwaaNi na twaM wettha parantapa ॥४-५॥

yena bhootaanyasheSheNa drakShyasyaatmanyatho mayi ॥४-३५॥

Source: Automatic ITRANS Transliteration

The blessed lord said,
Many of my births have passed, and of yours, O Arjun.
I know all of them. You do not know them, O foe-scorcher.

The blessed lord said,
Many births of mine have transpired, O Arjun, and of yours. I know all of them. You do not know them, O foe-scorcher.

Source: Milind S. Pandit

The Supreme Lord said: Both you and I have taken many births. I remember them all, O Arjuna, but you do not remember.

Source: The Bhagavad-Gita: The Sacred Song

The Blessed Lord said: Many, many births both you and I have passed. I can remember all of them, but you cannot, O subduer of the enemy!

Source: Bhagavad Gita As It Is