योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-211, verse-4

चिद्भानमात्रमित्युक्तं ब्रह्मेति कलिताभिधम् ।
परात्परमिति प्रोक्तं तत्तु निर्नामकं पदम् ॥ ४ ॥

cidbhānamātramityuktaṃ brahmeti kalitābhidham ,
parātparamiti proktaṃ tattu nirnāmakaṃ padam 4

4. It is said to be the reflection of the intellect, and named as Brahma from its immensity, it is termed the most transcendent, and something without any designation at all.