Musnad Ahmad 27:1386

Waki' narrated to us, Thabit ibn 'Umarah narrated to us, from Abu Tamimah al-Hujaymi, from Ibn 'Umar, who said: "I prayed with the Prophet, peace and blessings of Allah be upon him, and Abu Bakr, and 'Umar, and 'Uthman, and there is no prayer after the dawn [prayer] until the sun rises."