Sahih Bukhari
Times of the Prayers
Volume: 001 / Book Number: 010 / Hadith Number: 524
Narrated Abu Bakr bin Uthman bin Sahl bin Hunaif:
that he heard Abu Umama saying: We prayed the Zuhr prayer with 'Umar bin Abdul Aziz and then went to Anas bin Malik and found him offering the Asr prayer. I asked him, "O uncle! Which prayer have you offered?" He said 'The Asr and this is (the time of) the prayer of Allah s Apostle which we used to pray with him."