Mishkat al-Masabih #1926
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنِ الْبُخَارِيِّ تَعْلِيقًا قَالَ: كَانَ ابْنُ عُمَرَ يَحْتَجِمُ وَهُوَ صَائِمٌ ثُمَّ تَرَكَهُ فَكَانَ يَحْتَجِمُ بِاللَّيْلِ
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.
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About Mishkat al-Masabih
This hadith is #1926 from Mishkat al-Masabih, in the Book of Fasting.