MuU 2.2.2
यदर्चिमद्यदणुभ्योऽणु च यस्मिँल्लोका निहिता लोकिनश्च । तदेतदक्षरं ब्रह्म स प्राणस्तदु वाङ्मनः तदेतत्सत्यं तदमृतं तद्वेद्धव्यं सोम्य विद्धि
yadarcimadyadaṇubhyo'ṇu ca yasmi~llokā nihitā lokinaśca | tadetadakṣaraṃ brahma sa prāṇastadu vāṅmanaḥ tadetatsatyaṃ tadamṛtaṃ tadveddhavyaṃ somya viddhi
Sanskrit for this text is pending; the English follows the translator's numbering.
That which is brilliant, smaller than small, that on which the worlds are founded and their inhabitants, that is the indestructible Brahman, that is the breath, speech, mind; that is the true, that is the immortal. That is to be hit. Hit it, O friend!
Translated by F. Max Müller