Brahmajalasutta 2.13.4

2.13.4

Yañca kho idaṃ vuccati cittanti vā manoti vā viññāṇanti vā ayaṃ attā nicco dhuvo sassato avipariṇāmadhammo sassatisamaṃ tatheva ṭhassatī’ti.

That which is called “mind” or “sentience” or “consciousness”: that self is permanent, everlasting, eternal, imperishable, remaining the same for all eternity.’