Sanskrit: ऋग्भिरेतं यजुर्भिरन्तरिक्षंसामभिर्यत् तत् कवयो वेदयन्ते ।  तमोङ्कारेणैवायतनेनान्वेति विद्वान्यत्तच्छान्तमजरममृतमभयं परं चेति  इति प्रश्नोपनिषदि पञ्चमः प्रश्नः  
English:  7  The wise man, meditating on AUM, attains this world by means of the rik verses; the intermediate world by means of the yajur verses; and that which is known to the seers by means of the sama verses. And also through the syllable AUM he realises that which is tranquil, free from decay, death and fear and which is the Highest. 