ChU 2.10.5
एकविंशत्यादित्यम् आप्नोति । एकविंशो वा इतो ऽसाव् आदित्यः । द्वाविंशेन परम् आदित्याज् जयति । तन् नाकम् । तद् विशोकम्
ekaviṃśatyādityam āpnoti | ekaviṃśo vā ito 'sāv ādityaḥ | dvāviṃśena param ādityāj jayati | tan nākam | tad viśokam
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
With twenty-one syllables a man reaches the sun (and death), for the sun is the twenty-first from here; with the twenty-second he conquers what is beyond the sun: that is blessedness, that is freedom from grief.
Translated by F. Max Müller