Muwaththa' Malik · #1789
وَحَدَّثَنِي مَالِكٌ، أَنَّهُ بَلَغَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِنْ كَانَ دَوَاءٌ يَبْلُغُ الدَّاءَ فَإِنَّ الْحِجَامَةَ تَبْلُغُهُ " .
English
Malik related to me that he heard that the Messenger of Allah, may Allah bless him and grant him peace, said, "If there is a remedy that will reach the disease, then cupping will reach it