Genesis 17:11 And ye shall circumcise the flesh of your foreskin; and it shall be a token of the covenant betwixt me and you. 10 I MC VC

Exodus 31:13 Speak 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. 24 I MC VC