Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
abudawud:2375 – ʿAbdullāh b. Maslamah > Sulaymān / Ibn al-Mughīrah > Thābit

We would not allow a man who was fasting to get himself cupped due to abomination of hardship.  

أبو داود:٢٣٧٥ – حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ حَدَّثَنَا سُلَيْمَانُ يَعْنِي ابْنَ الْمُغِيرَةِ عَنْ ثَابِتٍ قَالَ قَالَ

أَنَسٌ مَا كُنَّا نَدَعُ الْحِجَامَةَ لِلصَّائِمِ إِلاَّ كَرَاهِيَةَ الْجَهْدِ