صَحِيحُ مُسْلِمٍ
Sahih Muslim 621 c
The Book of Mosques and Places of Prayer
It is recommended to pray `Asr early
وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنِ ابْنِ شِهَابٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ كُنَّا نُصَلِّي الْعَصْرَ ثُمَّ يَذْهَبُ الذَّاهِبُ إِلَى قُبَاءٍ فَيَأْتِيهِمْ وَالشَّمْسُ مُرْتَفِعَةٌ .
Anas b. Malik reported: We used to offer the 'Asr prayer, then one would go to Quba' and reach there and the sun would be still high.
Sahih Muslim, 621 cSahihصحيح