It was recorded by al-Bukhari in al-Adab al-Mufrad (p. 129) through Muhammad ibn ʿAmr, from Abu Salamah, from Abu Hurayrah, attributed to the Prophet.

I say: This chain of transmission is good.

766 — “Cupping on an empty stomach is most beneficial; it brings healing and blessing, and increases intelligence and memory. So have yourselves cupped, with Allah’s blessing, on Thursday. Avoid cupping on Wednesday, Friday, Saturday, and Sunday as a precaution; and have yourselves cupped on Monday and Tuesday, for Monday was the day on which Allah cured Job of his affliction, while He afflicted him on a Wednesday. Indeed, neither leprosy nor vitiligo appears except on a Wednesday or on the night before Wednesday.”

It was recorded by Ibn Majah (3487), Ibn ʿAdi (87/1), and al-Khatib in al-Faqih wa al-Mutafaqqih (224/2), with its opening portion, through ʿUthman ibn Matar, from al-Hasan ibn Abi Jaʿfar, from Muhammad ibn Jahadah, from Nafiʿ, from Ibn ʿUmar, who said: “O Nafiʿ, my blood has become agitated within me, so find me a cupper. If you can, make him gentle, and do not appoint an elderly man or a young boy, for I heard the Messenger of Allah, peace and blessings be upon him, say”—then he cited it.

Ibn ʿAdi said: “The defect may lie with ʿUthman ibn Matar, not with al-Hasan, for others narrate it from him.”

I say: Despite his worship and virtue, this al-Hasan was weak as a hadith narrator, as al-Hafiz stated in al-Taqrib. Al-Dhahabi said in al-Duʿafaʾ: “A group of scholars declared him weak.” ʿUthman ibn Matar is also weak. However, al-Hasan has been corroborated, as Ibn ʿAdi mentioned above.