Sahih Muslim Book - 5, Hadith - 1428

حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ الْحَنْظَلِىُّ أَخْبَرَنَا يَحْيَى بْنُ آدَمَ حَدَّثَنَا الْفُضَيْلُ بْنُ مَرْزُوقٍ عَنْ شَقِيقِ بْنِ عُقْبَةَ عَنِ الْبَرَاءِ بْنِ عَازِبٍ قَالَ نَزَلَتْ هَذِهِ الآيَةُ حَافِظُوا عَلَى الصَّلَوَاتِ وَصَلاَةِ الْعَصْرِ. فَقَرَأْنَاهَا مَا شَاءَ اللَّهُ ثُمَّ نَسَخَهَا اللَّهُ فَنَزَلَتْ ( حَافِظُوا عَلَى الصَّلَوَاتِ وَالصَّلاَةِ الْوُسْطَى) فَقَالَ رَجُلٌ كَانَ جَالِسًا عِنْدَ شَقِيقٍ لَهُ هِىَ إِذًا صَلاَةُ الْعَصْرِ. فَقَالَ الْبَرَاءُ قَدْ أَخْبَرْتُكَ كَيْفَ نَزَلَتْ وَكَيْفَ نَسَخَهَا اللَّهُ. وَاللَّهُ أَعْلَمُ.

It was narrated from Al-Fudail bin Marzuq from Shaqiq bin 'Uqbah, that Al-Bara' bin 'Azib said: "This verse was revealed - 'Guard strictly (five obligatory) prayers and 'Asr prayer...' and we recited it for as long as Allah willed, then Allah abrogated, it and revealed: 'Guard strictly (five obligatory) As-Salawat (the prayers) especially the middle Salat)... A man who was sitting beside Shaqiq said to him: "So it is the 'Asr prayer." Al-Bara' said: "I have told you how it was revealed and how it was abrogated, and Allah knows best."