Musnad Ahmad 27:1898

'Abd al-Razzaq and Ibn Bakr narrated to us, they said: Ibn Jurayj informed us, Nafi' informed me, that Ibn 'Umar used to say: I heard the Messenger of Allah, may Allah bless him and grant him peace, say: "He who misses the 'Asr prayer, it is as if he has been bereaved of his family and his wealth." I said to Nafi': "Until the sun sets?" He said: "Yes."