Exo 31:13Speak thou also unto the children of Israel, saying, Verily my sabbaths ye shall keep: for it is a sign between me and you throughout your generations; that ye may know that I am the LORD that doth sanctify you.
Eze 24:23And your tires shall be upon your heads, and your shoes upon your feet: ye shall not mourn nor weep; but ye shall pine away for your iniquities, and mourn one toward another.