كتاب الصيام
13  
The Book of Fasting
(14)
Chapter: The strict prohibition of intercourse during the day in Ramadan for one who is fasting; And the obligation of offering major expiation and the definition thereof; And that it is obligatory for both the one who can afford it and the one who cannot afford it, and it remains an obligation for the one who cannot afford it until he has the means
(14)
باب تَغْلِيظِ تَحْرِيمِ الْجِمَاعِ فِي نَهَارِ رَمَضَانَ عَلَى الصَّائِمِ وَوُجُوبِ الْكَفَّارَةِ الْكُبْرَى فِيهِ وبيانها وأنها تجب على الموسر والمعسر وتثبت في ذمة المعسر حتى يستطيع
Sahih Muslim 1112 b

'Abbad b. Abdullah b. Zubair narrated that he heard 'A'isha (Allah be pleased with her) saying:

A person came to the Messenger of Allah (ﷺ), and he then narrated the hadith. But (neither these words are found):" Give charity, give charity" (nor) his words:" during the day time".
وَحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، أَخْبَرَنَا عَبْدُ الْوَهَّابِ الثَّقَفِيُّ، قَالَ سَمِعْتُ يَحْيَى بْنَ سَعِيدٍ، يَقُولُ أَخْبَرَنِي عَبْدُ الرَّحْمَنِ بْنُ الْقَاسِمِ، أَنَّ مُحَمَّدَ بْنَ جَعْفَرِ بْنِ الزُّبَيْرِ، أَخْبَرَهُ أَنَّ عَبَّادَ بْنَ عَبْدِ اللَّهِ بْنِ الزُّبَيْرِ حَدَّثَهُ أَنَّهُ، سَمِعَ عَائِشَةَ، - رضى الله عنها - تَقُولُ أَتَى رَجُلٌ إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَذَكَرَ الْحَدِيثَ وَلَيْسَ فِي أَوَّلِ الْحَدِيثِ ‏ "‏ تَصَدَّقْ تَصَدَّقْ ‏"‏ ‏.‏ وَلاَ قَوْلُهُ نَهَارًا ‏.‏
Reference : Sahih Muslim 1112b
In-book reference : Book 13, Hadith 108
USC-MSA web (English) reference : Book 6, Hadith 2464
  (deprecated numbering scheme)