Deuteronomy 8:1-2

1Every commandment which I command thee this day shall ye take heed to do, that ye may live, and multiply, and enter in and possess the land which Jehovah swore unto your fathers.

2And thou shalt remember all the way which Jehovah thy 1God led thee these forty years in the wilderness, to humble thee, and to prove thee, to know what was in thy heart, whether thou wouldest keep his commandments or not.