Musnad Ahmad 1153:914

'Affan narrated to us, he said: Wuhayb narrated to us, he said: 'Abdullah ibn Tawus narrated to me, from his father, from 'Aishah, that she said: "Umar erred. The Messenger of Allah (peace and blessings of Allah be upon him) only forbade prayer when one intends to perform it at the rising of the sun and its setting."