(13) باب اسْتِحْبَابِ صَلاَةِ الضُّحَى وَأَنَّ أَقَلَّهَا رَكْعَتَانِ وَأَكْمَلَهَا ثَمَانِ رَكَعَاتٍ وَأَوْسَطَهَا أَرْبَعُ رَكَعَاتٍ أَوْ سِتٌّ وَالْحَثِّ عَلَى الْمُحَافَظَةِ عَلَيْهَا
Mua'ada 'Adawiyya reported 'A'isha as saying:
The Messenger of Allah (ﷺ) used to observe four rak'ahs in the forenoon prayer and he sometimes observed more as Allah pleased. (PT)
Reference (PT): Sahih Muslim 719 c (PT)
In-book reference (PT): Book 6, Hadith 95 (PT)
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1551 (PT)