Authentic
graded by Al-Albani
Mishkat al-Masabih 2982
Narrator:Ibn ‘Abbās
وَعَنِ ابْنِ عَبَّاسٍ: أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ احْتَجَمَ فَأَعْطَى الْحَجَّامَ أجره واستعط
Ibn ‘Abbas said the Prophet had himself cupped and gave the cupper his pay; and he poured medicine into his nose. (Bukhari and Muslim.)
Cited in Mishkat al-Masabih (No. 2982).