أَخْبَرَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ الرَّحْمَنِ، قَالَ حَدَّثَنَا حُصَيْنُ بْنُ عَبْدِ الرَّحْمَنِ، عَنْ أَبِي إِسْحَاقَ، عَنْ عَاصِمِ بْنِ ضَمْرَةَ، قَالَ سَأَلْتُ عَلِيَّ بْنَ أَبِي طَالِبٍ عَنْ صَلاَةِ، رَسُولِ اللَّهِ صلى الله عليه وسلم فِي النَّهَارِ قَبْلَ الْمَكْتُوبَةِ قَالَ مَنْ يُطِيقُ ذَلِكَ ثُمَّ أَخْبَرَنَا قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يُصَلِّي حِينَ تَزِيغُ الشَّمْسُ رَكْعَتَيْنِ وَقَبْلَ نِصْفِ النَّهَارِ أَرْبَعَ رَكَعَاتٍ يَجْعَلُ التَّسْلِيمَ فِي آخِرِهِ .
It was narrated from Abu Ishaq, that Asim bin Damrah said: "I asked 'Ali bin Abi Talib about the prayer of the Messenger of Allah (PBUH) during the day before the prescribed prayers. He said: 'Who is able to do that?' Then he told us:'The Messenger of Allah (PBUH) used to pray two Rak'ahs when the sun had passed its zenith, and four Rak'ahs before the middle of the day, with the Taslim at the end."' Translation Not Available
Book Ref: Sunan An Nisai Book 10 Hadith 875
Web Ref: Sunan An Nisai Vol 1 Book 10 Hadith 876