The Samaveda (Sanskrit: सामवेद, sāmaveda, from sāman "melody" + veda "knowledge" ), is second (in the usual order) of the four Vedas, the ancient core Hindu scriptures. Its earliest parts are believed to date from 1000 BC and it ranks next in sanctity and liturgical importance to the Rigveda. It consists of a collection (samhita) of hymns, portions of hymns, and detached verses, all but 75 taken from the Rigveda, to be sung, using specifically indicated melodies called Samagana, by Udgatar priests at sacrifices in which the juice of the Soma plant, clarified and mixed with milk and other ingredients, is offered in libation to various deities.