5. The Book of Mosques and Places of Prayer - كتاب الْمَسَاجِدِ وَمَوَاضِعِ الصَّلاَةِ
34) Chapter: Preference For Saying The'asr Prayer At The Commencement Of The Prescribed Time
Anas b. Malik reported:
We used to offer the afternoon prayer (at such a time) that a person would go to Bani 'Amr b. Auf and he would find them busy offering the afternoon prayer.