Narayana Sūkta.12

tasyāḥ śikhāyā madhyē paramātmā vyavasthitaḥ। sa brahma sa śivaḥ sa hariḥ sa indraḥ sō'kṣaraḥ paramaḥ svarāṭ॥

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.