The Messenger of Allah ﷺ got him self cupped and gave the cupper his wages. Had he considered it impure, he would not have given it (wage) to him.

احْتَجَمَ رَسُولُ اللَّهِ ﷺ وَأَعْطَى الْحَجَّامَ أَجْرَهُ وَلَوْ عَلِمَهُ خَبِيثًا لَمْ يُعْطِهِ

It was narrated from ʿAli ؓ that The Messenger of Allah ﷺ was treated with cupping and he gave the cupper his fee. (Using translation from Aḥmad 1129)

أَنَّ رَسُولَ اللهِ ﷺ احْتَجَمَ وَأَعْطَاهُ أَجْرَهُ

[Machine] The Prophet of Allah ﷺ turned away and rewarded him, even if he knew that there was harm in him, he would not have given him.

«احْتَجَمَ رَسُولُ اللهِ ﷺ وَآجَرَهُ وَلَوْ عَلِمَ أَنَّ بِهِ بَأْسًا لَمْ يُعْطِهِ»

The Messenger of Allah ﷺ got him self cupped and gave the cupper his wages. Had he considered it impure, he would not have given it (wage) to him. (Using translation from Abū Dāʾūd 3423)

«احْتَجَمَ رَسُولُ اللهِ ﷺ وَأَعْطَى الْحَجَّامَ أَجْرَهُ وَلَوْ عَلِمَهُ خَبِيثًا لَمْ يُعْطِهِ»

The Messenger of Allah ﷺ got him self cupped and gave the cupper his wages. Had he considered it impure, he would not have given it (wage) to him. (Using translation from Abū Dāʾūd 3423)

احْتَجَمَ رَسُولُ اللهِ ﷺ وَأَعْطَى الْحَجَّامَ أَجْرَهُ وَلَوْ عَلِمَهُ خَبِيثًا لَمْ يُعْطِهِ