7-65 Muhammad ibn al-Hassan - may God be pleased with him - narrated that Muhammad ibn Yahya al-Attar quoted Muhammad ibn Ahmad, on the authority of Al-Hassan ibn al-Hussein al-Lu’lu’ee, on the authority of either or both Muhammad ibn Isma’il and Ahmad ibn al-Hassan al-Maysami, on the authority of Ibrahim ibn Mihzam that someone had narrated that Aba Abdullah as-Sadiq (MGB) said,

“God’s Prophet (MGB) had blood-letting done on Monday afternoons.”