Jeremiah 11:3-4

and say thou unto them, Thus saith the LORD God of Israel; Cursed be the man that obeyeth not the words of this covenant, which I commanded your fathers in the day that I brought them forth out of the land of Egypt, from the iron furnace, saying, Obey my voice, and do them, according to all which I command you: so shall ye be my people, and I will be your God