Ki Tetze: Chapter 24

One must not start anything on Monday or Wednesday


We learn of the astrological reasons for not starting anything on a Monday or a Wednesday. Both the children of Yisrael and the children of Ishmael calculate according to the moon, but Yisrael are attached to its good part and the children of Ishmael to its evil part. We are told that the dominion of both Saturn and Shabbat is on the seventh day, the day of rest. People should not start things on Mondays or Wednesdays because Gehenom was created on the second day and the eclipse of the luminaries on the fourth day.