Mishkat al-Masabih #3649

He told that God’s Messenger and his companions went off and reached Badr before the polytheists, and when the polytheists arrived he said, “Rise to go to a garden whose breadth is as great as the heavens and the earth.” ‘Umair b. al-Humam thereupon said, “Bravo, bravo!” and when God’s Messenger asked him what had made him say that, he replied, “Nothing, I swear by God, Messenger of God, but a hope that I might be among its inhabitants.” He told him that he would be among them. He then took some dates out of his quiver and began to eat them, but after a little said, “If I live till I eat my dates it will mean a long life.” So he threw away the dates he had and then fought with the enemy till he was killed. Muslim transmitted it.