Once the Prophet ﷺ got his blood out (medically) and paid that person who had done it. If it had been illegal, the Prophet ﷺ would not have paid him.  

احْتَجَمَ النَّبِيُّ ﷺ وَأَعْطَى الَّذِي حَجَمَهُ وَلَوْ كَانَ حَرَامًا لَمْ يُعْطِهِ  

[Machine] The Messenger of Allah ﷺ performed hijama (cupping) and gave the cupper his payment, even though it was forbidden. The Messenger of Allah ﷺ did not give it to him.  

احْتَجَمَ رَسُولُ اللهِ ﷺ وَأَعْطَى الْحَجَّامَ أَجْرَهُ وَلَوْ كَانَ سُحْتًا لَمْ يُعْطِهِ رَسُولُ اللهِ ﷺ  

[Machine] The Messenger of Allah ﷺ frowned and gave him his reward, even though what he gave him was forbidden.  

احْتَجَمَ رَسُولُ اللهِ ﷺ وَأَعْطَاهُ أَجْرَهُ وَلَوْ كَانَ حَرَامًا مَا أَعْطَاهُ  

[Machine] The Messenger of Allah ﷺ had his camel's saddle tied up with a camel's hair while in the state of ihram.  

«احْتَجَمَ رَسُولُ اللَّهِ ﷺ بِلَحْيِ جَمَلٍ وَهُوَ مُحْرِمٌ»