Deuteronomy 15:5 in the King James Version
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.
Context
4 However there will be no poor with you (for the LORD will surely bless you in the land which the LORD your God gives you for an inheritance to possess)
5 if only you diligently listen to the LORD your God’s voice, to observe to do all this commandment which I command you today.
6 For the LORD your God will bless you, as he promised you. You will lend to many nations, but you will not borrow. You will rule over many nations, but they will not rule over you.