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.English Standard Version
if only you will strictly obey the voice of the LORD your God, being careful to do all this commandment that I command you today.Catholic Public Domain Version
But only if you heed the voice of the Lord your God, and keep to all that he has ordered, that which I am entrusting to you this day, will he bless you, just as he has promised