Abu Dawud Book 22, Hadith Number 3853.

Narated By Kabshah daughter of AbuBakrah : (the narrator other than Musa said that Kayyisah daughter of AbuBakrah) She said that her father used to forbid his family to have themselves cupped on a Tuesday, and used to assert on the authority of the Apostle of Allah (PBUH) that Tuesday is the day of blood in which there is an hour when it does not stop.