7-69 Muhammad ibn al-Hassan - may God be pleased with him - narrated that Sa’ed ibn Abdullah quoted Ahmad ibn Aba Abdullah al-Barqy, on the authority of Abil Khazraj (al-Hassan ibn al-Zebarqan al-Qumi), on the authority of Suleiman, on the authority of Abi Nazrat, on the authority of AbiSa’id al-Khidry that God’s Prophet (MGB) said,

“Whoever has phlebotomy done for him on the Tuesday of the seventeenth, nineteenth days or the twenty-first day of each month shall be relieved of every ailment up until the next year. If he does so on a different day, he shall be relieved of headaches, toothaches, insanity, leprosy and vitiligo.”