Musannaf Ibn Abi Shayba 13:2657

Abu Bakr narrated to us, he said: Ibn Abi Za’idah narrated to us, from Hajjaj, from Abu al-Zubayr, from Tawus, from Ibn Abbas, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The *‘Umra* (gift of a lifetime) is permissible for the one to whom it is given."