It was narrated that Abu Salamah said:
"We prayed at the time of 'Umar bin 'Abdul-'Aziz, then we went to Anas bin Malik and found him praying. when he finished he said to us: 'Have you prayed?' We said: 'We prayed Zuhr.' He said: 'I prayed 'Asr.' They said: 'You have prayed early.' He said: 'Rather I prayed as I saw my companions pray.'" (DE)
English reference (DE): Vol. 1, Book 6, Hadith 511 (DE)
Arabic reference (DE): Book 6, Hadith 514 (DE)