Sayyiduna Anas (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "Make it your practice to have cupping done and to use sea costus (qust bahri)."
Al-Bazzar recorded it, and al-Tabarani in al-Mu'jam al-Awsat. The narrators of al-Bazzar are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطب / 8317