Bhagavad Gita 7.26

वेदाहं समतीतानि वर्तमानानि चार्जुन |
भविष्याणि च भूतानि मां तु वेद न कश्चन

Translation

O Arjun, I know of past, present, and future, and I also know all living beings; but Me no one knows.