New Living Translation
Study this Book of Instruction continually. Meditate on it day and night so you will be sure to obey everything written in it. Only then will you prosper and succeed in all you do.

American Standard Version
This book of the law shall not depart out of thy mouth, but thou shalt meditate thereon day and night, that thou mayest observe to do according to all that is written therein: for then thou shalt make thy way prosperous, and then thou shalt have good success.

Berean Study Bible
This Book of the Law must not depart from your mouth; meditate on it day and night, so that you may be careful to do everything written in it. For then you will prosper and succeed in all you do.

Douay-Rheims Bible
Let not the book of this law depart from thy mouth: but thou shalt meditate on it day and night, that thou mayst observe and do all things that are written in it: then shalt thou direct thy way, and understand it.

English Revised Version
This book of the law shall not depart out of thy mouth, but thou shalt meditate therein day and night, that thou mayest observe to do according to all that is written therein: for then thou shalt make thy way prosperous, and then thou shalt have good success.

King James Bible
This book of the law shall not depart out of thy mouth; but thou shalt meditate therein day and night, that thou mayest observe to do according to all that is written therein: for then thou shalt make thy way prosperous, and then thou shalt have good success.

World English Bible
This book of the law shall not depart out of your mouth, but you shall meditate on it day and night, that you may observe to do according to all that is written therein: for then you shall make your way prosperous, and then you shall have good success.

Young's Literal Translation
the book of this law doth not depart out of thy mouth, and thou hast meditated in it by day and by night, so that thou dost observe to do according to all that is written in it, for then thou dost cause thy way to prosper, and then thou dost act wisely.

Joshua 1:8 Additional Translations ...