Wherefore it shall come to pass, if ye hearken to these judgments, and keep, and do them, that the LORD thy God shall keep unto thee the covenant and the mercy which He sware unto thy fathers. . .  Thou shalt be blessed above all people. . . And the LORD will take away from thee all sickness, and will put none of the evil diseases of Egypt, which thou knowest, upon thee. . . 

                                - Deuteronomy 7:12-15