أفطرَ الحاجمُ والمحجومُ .

 أولُ ما كُرِهَتِ الحجامةُ للصائمِ ، أن جعفرَ بنَ أبي طالبٍ احتجم وهو صائمٌ ، فمر به النبيُّ صلى اللهُ عليهِ وسلَّمَ فقال : أفطر هذان ، ثم رخَّصَ النبيُّ صلى اللهُ عليهِ وسلَّمَ بعد للصائمِ في الحجامةِ ، وكان أنسٌ يحتجمُ وهو صائمٌ .

The first time the Hujamah was  disliked , was when Jafar Ibn Abi Taleb  got Hujamah done when he was fasting, so the Prophet ﷺ ordered him them both to break their fasts, then later on  the Prophet ﷺ  gave a consecetion to the person that got done Hujamah when fasting, and Anas would get Hujamah done when fasting. (الدارقطني)

Shaykh Ruhayli said: that the origin of getting Hujamah done is prohibited because the Prophet ﷺ would of not said he gave a concession to it, and nothing is given a concession accept that the origins of ot is Haram. So the origins go back to the Hadith in which the Prophet ﷺ said:   أفطرَ الحاجمُ والمحجومُ .

Shaykh Fawzan said: that the person that donates blood his fasting is nullified according to the Hadith  أفطرَ الحاجمُ والمحجومُ .