كتاب الصوم
7  
Fasting
(4c)
Chapter: Keeping the Fast free from Imperfection - Section 3
(3)
باب تنزيه الصوم - الفصل الثالث
Mishkat al-Masabih 2017
Bukhari said without a complete isnad that Ibn ‘Umar used to have himself cupped whan he was fasting. Then he abandoned it and had himself cupped at night.
وَعَنِ الْبُخَارِيِّ تَعْلِيقًا قَالَ: كَانَ ابْنُ عُمَرَ يَحْتَجِمُ وَهُوَ صَائِمٌ ثُمَّ تَرَكَهُ فَكَانَ يَحْتَجِمُ بِاللَّيْلِ
  لم تتمّ دراسته   (الألباني) حكم   :
Reference : Mishkat al-Masabih 2017
In-book reference : Book 7, Hadith 61