The Mahabharata of Krishna-Dwaipayana Vyasa…
“ Rama then answered Yudhishthira in these sweet and righteous words that were highly beneficial to heroes, "I have heard it said by the Rishis, O best of kings, that Kurukshetra is a highly sacred and sin-cleansing spot, equal to heaven itself, adored by gods and Rishis and high-souled Brahmanas! Those men that cast off their bodies while engaged in battle on this field, are sure to reside, O sire, in heaven with Shakra himself! ”
