King James Bible
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.

New King James Version
only if you carefully obey the voice of the LORD your God, to observe with care all these commandments which I command you today.

American Standard Version
if only thou diligently hearken unto the voice of Jehovah thy God, to observe to do all this commandment which I command thee this day.

Berean Study Bible
if only you obey the LORD your God and are careful to follow all these commandments I am giving you today.

Douay-Rheims Bible
Yet so if thou hear the voice of the Lord thy God, and keep all things that he hath ordained, and which I command thee this day, he will bless thee, as he hath promised.

English Revised Version
if only thou diligently hearken unto the voice of the LORD thy God, to observe to do all this commandment which I command thee this day.

World English Bible
if only you diligently listen to the voice of Yahweh your God, to observe to do all this commandment which I command you this day.

Young's Literal Translation
'Only, if thou dost diligently hearken to the voice of Jehovah thy God, to observe to do all this command which I am commanding thee to-day,

Deuteronomy 15:5 Additional Translations ...