Musnad Ahmad 1018:60

Muhammad ibn Ja‘far narrated to us, Shu‘bah narrated to us, from al-Azraq ibn Qays, from ‘Abdullah ibn Rabah, from a man among the companions of the Prophet, may Allah bless him and grant him peace, that the Messenger of Allah, may Allah bless him and grant him peace, prayed the ‘Asr prayer. Then a man stood up to pray, and ‘Umar saw him and said to him: "Sit down, for the People of the Book only perished because there was no interval between their prayers." The Messenger of Allah, may Allah bless him and grant him peace, said: "Ibn al-Khattab has done well."