«كان يحتجم في الأخدعين والكاهل وكان يحتجم لسبع عشرة وتسع عشرة وإحدى وعشرين»
It was the practice of the Prophet (peace and blessings be upon him):
"He (peace and blessings be upon him) would have himself cupped on the two veins of the neck and between the shoulders, and he would have himself cupped on the 17th, 19th and 21st of the month."
Hadith Referenceصحیح الجامع الصغیر / حرف الكاف / 4927
Hadith Gradingالألبانی:حسن
Hadith Takhrij[ت ك] عن أنس [طب ك] عن ابن عباس. الصحيحة ٩٠٨.