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 ﷺ during the day before the prescribed prayers. He said: 'Who is able to do that?' Then he told us:'The Messenger of Allah ﷺ 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."'

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 ﷺ فِي النَّهَارِ قَبْلَ الْمَكْتُوبَةِ قَالَ مَنْ يُطِيقُ ذَلِكَ ثُمَّ أَخْبَرَنَا قَالَ كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي حِينَ تَزِيغُ الشَّمْسُ رَكْعَتَيْنِ وَقَبْلَ نِصْفِ النَّهَارِ أَرْبَعَ رَكَعَاتٍ يَجْعَلُ التَّسْلِيمَ فِي آخِرِهِ .