Puruṣa Sūkta is hymn 10.90 of the Rigveda, dedicated to the Purusha, the "Cosmic Being". It is also found in the Shukla Yajurveda Samhita 30.1-16 and Atharva Veda Samhita 19.6.
The Purusha Sukta gives a description of the spiritual unity of the universe. It presents the nature of Purusha, or the cosmic being, as both immanent in the manifested world and yet transcendent to it. From this being, the Sukta holds, the original creative will (identified with Viswakarma, Hiranyagarbha or Prajapati) proceeds which causes the projection of the universe in space and time. The Purusha Sukta, in the seventh verse, hints at the organic connectedness of the various classes of society.
The Purusha is defined in verses 2 to 5 of the Sukta. He is described as a being who pervades everything conscious and unconscious universally. He is poetically depicted as a being with thousand heads, eyes and legs, enveloping not just the earth, but the entire universe from all sides and transcending it by ten fingers length - or transcending in all 10 dimensions. All manifestations, in past, present and future, is held to be the Purusha alone. It is also proclaimed that he transcends his creation.
Source: wikipedia
