(Exodus 15:26) "And He said: If pay heed, you shall pay heed": From here it was derived: If a man paid heed to one mitzvah, he is caused to pay heed to many mitzvoth, it being written "If pay heed, you shall pay heed." If a man forgot one mitzvah, he is caused to forget many mitzvoth, viz. (Devarim 8:19) "If forget, you shall forget." "to the voice of the L–rd": This refers to the Ten Commandments, which were from Mouth to mouth through the medium of "voices." "and you do what is just in His eyes": These are select aggadoth, which are "heard" in the ears of all men. "and you give ear to His mitzvoth" — Mishnayoth. "and you keep all His statutes" — halachoth. "all of the illness which I placed in Egypt I will not place upon you." But if I do place it upon you — "for I am the L–rd who heals you." These are the words of R. Yehoshua.