[Machine] About the voluntary prayers of the Messenger of Allah ﷺ during the day, he asked, "Who among you can bear it?" We said, "We will take from him what we can handle." He used to delay until the sun appeared similar to its appearance from the west at the time of Asr (afternoon prayer), then he stood up and prayed two units of prayer. Then he delayed until the sun rose and set, and it was similar to its appearance from the east at Dhuhr (noon prayer), then he stood up and prayed four units of prayer, separating each two units with the tasleem (saying salutation). He then delayed until the sun disappeared, and he prayed four units of prayer before Dhuhr, separating each two units with the tasleem. Then he mentioned the tradition in a similar manner. These are the sixteen voluntary units of prayer that the Prophet ﷺ used to perform during the day, and he rarely continued with them. This was mentioned exclusively by 'Asim bin Damrah from 'Ali, and Abdullah bin Al-Mubarak used to increase it, and his narration of this tradition was criticized. And Allah knows best.
عَنْ تَطَوَّعِ رَسُولِ اللهِ ﷺ بِالنَّهَارِ فَقَالَ مَنْ يُطِيقُ ذَلِكَ مِنْكُمْ؟ قُلْنَا نَأْخُذُ مِنْهُ مَا أَطَقْنَا قَالَ كَانَ يُمْهِلُ حَتَّى إِذَا كَانَتِ الشَّمْسُ مِنْ قِبَلِ الْمَشْرِقِ كَهَيْئَتِهَا مِنْ قِبَلِ الْمَغْرِبِ عِنْدَ الْعَصْرِ قَامَ فَصَلَّى رَكْعَتَيْنِ ثُمَّ يُمْهِلُ حَتَّى إِذَا ارْتَفَعَتِ الشَّمْسُ وَحَلَّقَتْ وَكَانَتْ مِنَ الْمَشْرِقِ كَهَيْئَتِهَا مِنَ الْمَغْرِبِ عِنْدَ الظُّهْرِ قَامَ فَصَلَّى أَرْبَعَ رَكَعَاتٍ يَفْصِلُ بَيْنَ كُلِّ رَكْعَتَيْنِ بِالتَّسْلِيمِ عَلَى الْمَلَائِكَةِ الْمُقَرَّبِينَ وَالنَّبِيِّينَ وَمَنْ تَبِعَهُمْ مِنَ الْمُؤْمِنِينَ وَالْمُسْلِمِينَ ثُمَّ يُمْهِلُ حَتَّى إِذَا زَالَتِ الشَّمْسُ صَلَّى أَرْبَعَ رَكَعَاتٍ قَبْلَ الظُّهْرِ يَفْصِلُ بِمِثْلِ ذَلِكَ ثُمَّ يُصَلِّي الظُّهْرَ ثُمَّ يُصَلِّي بَعْدَهَا رَكْعَتَيْنِ ثُمَّ يُصَلِّي قَبْلَ الْعَصْرِ أَرْبَعَ رَكَعَاتٍ يَفْصِلُ بَيْنَ كُلِّ رَكْعَتَيْنِ بِمِثْلِ ذَلِكَ ثُمَّ ذَكَرَ الْحَدِيثَ بِنَحْوِهِ فَهَذِهِ سِتَّ عَشْرَةَ رَكْعَةً تَطَوُّعُ النَّبِيِّ ﷺ بِالنَّهَارِ وَقَلَّمَا يُدَاوِمُ عَلَيْهَا تَفَرَّدَ بِهِ عَاصِمُ بْنُ ضَمْرَةَ عَنْ عَلِيٍّ ؓ وَكَانَ عَبْدُ اللهِ بْنُ الْمُبَارَكِ يُضَعِّفُهُ فَيَطْعَنُ فِي رِوَايَتِهِ هَذَا الْحَدِيثَ وَاللهُ أَعْلَمُ