Musnad Ahmad 27:406

Yazid ibn Harun narrated to us, Hajjaj ibn Artah informed us, from Nafi, from Ibn Umar: "The Messenger of Allah (peace be upon him) handed over Khaybar to its people for half [of the produce]. It remained with them throughout the entire life of the Messenger of Allah (peace be upon him), and the life of Abu Bakr, and the life of Umar, until Umar sent me to divide it with them. They bewitched me, so my hand became contracted (paralyzed/shriveled), and Umar took it [the land] away from them."