Chapter 1 · Verse 13

निर्गुणं ब्रह्म तत्सर्वं नित्यस्वच्छगुणान्वितम् । नारायणादिरूपाणि ज्ञातानि चास्माभिरच्युते ॥ १३ ॥

We know all of that as the attributeless Brahman, eternally pure yet endowed with qualities; in the Imperishable we also know forms beginning with Nārāyaṇa.