Narayana Sūkta.12

तस्याः शिखाया मध्ये परमात्मा व्यवस्थितः। स ब्रह्म स शिवः स हरिः स इन्द्रः सोऽक्षरः परमः स्वराट्॥

At the tip of such effulgence, at the centre, the supreme essence, ParamaAtma , is situated. He only is Brahman, the ultimate reality; He only is Shiva, the auspicious; He only is Hari, the remover of obstacles; He only is Indra, the ruler of mind and senses; He, the supreme and independent, only is Akshara, the imperishable.