The Lord spoke to Moses saying,(Leviticus 22)+Feasts of the Lord (Leviticus 23)

 (Leviticus 22)    "Speak to Aaron and his sons that they separate themselves from the holy things of the children of Israel, and that they do NOT profane My holy name in those things which they sancity to Me.

(Leviticus 23)    The Lord spoke to Moses, saying,  "Speak to the children of Israel, and say to them:  The feast of the Lord, which you shall proclaim to be holy convocations these are My feasts:  The Sabbath, The Passover and Unleanen Bread, etc.