بُلُوغُ الْمَرَامِ
Bulugh al-Maram 447
The Book of Prayer
وَعَنْ سَهْلِ بْنِ سَعْدٍ رَضِيَ اَللَّهُ عَنْهُمَا قَالَ: { مَا كُنَّا نَقِيلُ وَلَا نَتَغَدَّى إِلَّا بَعْدَ اَلْجُمُعَةِ } مُتَّفَقٌ عَلَيْهِ, وَاللَّفْظُ لِمُسْلِمٍ . [1] .
Narrated Sahl bin Sa'd (RA): We would not have a siesta (mid-day nap) nor lunch till after the Friday prayer. [Agreed upon; and the wording is Muslim's].
Sunnah.com reference: Book 2, Hadith 363