Devarim 4:1-2

Now therefore shema, Yisroel, unto the chukkim and unto the mishpatim, which I melammed (teach) you, to do them, in order that ye may live, and go in and possess ha'aretz which HASHEM Elohei Avoteichem giveth you. Ye shall not add unto the word which I command you, neither shall ye take anything from it, that ye may be shomer mitzvot of the commandments of HASHEM Eloheichem which I command you.