We asked ‘Ali ؓ about the voluntary prayers of the Prophet ﷺ during the day. ʿAli said: That was sixteen voluntary rakʿahs that the Messenger of Allah ﷺ did during the day, and it is very rare for anyone to persist in doing that. Wakee told us: And my father said: Habeeb bin Abi Thabit said: O Abu Ishaq, I would not like to have gold as much as would fill this mosque in return for this hadeeth of yours.
عَنْ تَطَوُّعِ النَّبِيِّ ﷺ بِالنَّهَارِ قَالَ قَالَ عَلِيٌّ تِلْكَ سِتَّ عَشْرَةَ رَكْعَةً تَطَوُّعُ رَسُولِ اللهِ ﷺ بِالنَّهَارِ وَقَلَّ مَنْ يُدَاوِمُ عَلَيْهَا