Deuteronomy 16:4
16:4 There must not be a scrap of yeast within your land
for seven days, nor can any of the meat you sacrifice on the evening of the first day remain until the next morning.
Deuteronomy 28:25
Curses by Defeat and Deportation
28:25 “The Lord will allow you to be struck down before your enemies; you will attack them from one direction but flee from them in seven directions and will become an object of terror to all the kingdoms of the earth.