Deuteronomy 29:9 in the King James Version
Keep therefore the words of this covenant, and do them, that ye may prosper in all that ye do.
Context
8 We took their land, and gave it for an inheritance to the Reubenites, and to the Gadites, and to the half-tribe of the Manassites.
9 Therefore keep the words of this covenant and do them, that you may prosper in all that you do.
10 All of you stand today in the presence of the LORD your God: your heads, your tribes, your elders, and your officers, even all the men of Israel,