Under the OT Law a woman was declared ceremonially unclean during menstruation.
Tohoroth or Teh., " purifications," a euphemism for things which are ritually or ceremonially " unclean."
The marriage of young people was usually arranged between the relatives, the bridegroom's father providing the bride-price, which with other presents the suitor ceremonially presented to the bride's father.
Considering however the two sections of the Passover separately, it is remarkable how many of the ceremonies associated either historically or ceremonially with the Passover have connexion with the idea of a covenant.
Their food must be purchased with money lawfully acquired; and lest they should unwittingly partake of any that is ceremonially unclean, they require those Jahels, whose hospitality they share, to supply their wants from a store set apart for their exclusive use.