KAṬHA UPANISHAD · 1.3.15

अशब्दमस्पर्शमरूपमव्ययं
तथाऽरसं नित्यमगन्धवच्च यत् ।
अनाद्यनन्तं महतः परं ध्रुवं
निचाय्य तन्मृत्युमुखात् प्रमुच्यते ॥ १५॥

aśabdamasparśamarūpamavyayaṃ
tathā’rasaṃ nityamagandhavacca yat ।
anādyanantaṃ mahataḥ paraṃ dhruvaṃ
nicāyya tanmṛtyumukhāt pramucyate ॥ 15॥

That in which sound is not, nor touch, nor shape, nor diminution, nor taste, nor smell, that which is eternal, and It is without end or beginning, higher than the Great Self and stable, — that having seen, from the mouth of death there is deliverance.

Sri Aurobindo · CWSA 18, p. 116