Mbh 9.53.3a

"The Rishis said, 'In days of yore, O Rama, Kuru was engaged in perseveringly tilling the soil of this field. Shakra, coming down from heaven, asked him the reason, saying, "Why O king, art thou employed (in this task) with such perseverance? What is thy purpose, O royal sage, for the accomplishment of which thou art tilling the soil?" Kuru thereupon replied, saying, "O thou of a hundred sacrifices, they that will die upon this plain shall proceed to regions of blessedness after being cleansed of their sins!" The lord Shakra, ridiculing this, went back to heaven. The royal sage Kuru, however, without being at all depressed, continued to till the soil. Shakra repeatedly came to him and repeatedly receiving the same reply went away ridiculing him. Kuru, however, did not, on that account, feel depressed. Seeing the king till the soil with unflagging perseverance, Shakra summoned the celestials and informed them of the monarch's occupation. Hearing Indra's words, the celestials said unto their chief of a 1,000 eyes, "Stop the royal sage, O Shakra by granting him a boon, if thou canst! If men, by only dying there were to come to heaven, without having performed sacrifices to us, our very existence will be endangered!" Thus exhorted, Shakra then came back to that royal sage and said, "Do not toil any more! Act according to my words! Those men that will die here, having abstained from food with all their senses awake, and those that will perish here in battle, shall, O king, come to heaven! They, O thou of great soul, shall enjoy the blessings of heaven, O monarch!" Thus addressed, king Kuru answered Shakra, saying, "So be it!" Taking Kuru's leave, the slayer of Vala, Shakra, then, with a joyful heart, quickly went back to heaven. Even thus, O foremost one of Yadu's race, that royal sage had, in days of yore, tilled this plain and Shakra had promised great merit unto those that would cast off their bodies here.