Musnad Ahmad 30:1447

Bahz and ‘Affan narrated to us, they said: Hammam narrated to us, Qatadah narrated to us, he said: Sulayman ibn Yasar said to me: "What do you say regarding the *‘Umra* (gift of a lifetime)?" I said: An-Nadr ibn Anas narrated to us, from Bashir ibn Nahik, from Abu Hurayrah, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "The *‘Umra* is permissible."