Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: I went in to the Messenger of Allah (peace and blessings be upon him) while he (peace and blessings be upon him) was having cupping done on a Tuesday. I said: "Are you having cupping done on this day?" He (peace and blessings be upon him) said: "Yes; and whoever of you finds that a Tuesday falls on the seventeenth night of the month, let him not let that date pass until he has had cupping done. So have cupping done."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11318