Deuteronomy 15:5 KJV
Only if thou carefully hearken unto the voice of the Lord thy God, to observe to do all these commandments which I command thee this day.
Deuteronomy 15:5, King James Version
In context
4 Save when there shall be no poor among you; for the Lord shall greatly bless thee in the land which the Lord thy God giveth thee for an inheritance to possess it:
5 Only if thou carefully hearken unto the voice of the Lord thy God, to observe to do all these commandments which I command thee this day.
6 For the Lord thy God blesseth thee, as he promised thee: and thou shalt lend unto many nations, but thou shalt not borrow; and thou shalt reign over many nations, but they shall not reign over thee.