Joshua 1:8

8 Keep this Book of the Law always on your lips; meditate on it day and night, so that you may be careful to do everything written in it. Then you will be prosperous and successful.

Read Joshua 1:8 Using Other Translations

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.
This Book of the Law shall not depart from your mouth, but you shall meditate on it day and night, so that you may be careful to do according to all that is written in it. For then you will make your way prosperous, and then you will have good success.
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.

What does Joshua 1:8 mean?

John Gill's Exposition of the Bible
Joshua 1:8

This book of the law shall not depart out of thy mouth
He was often to read it, frequently repeat it, and speak of it, to refresh his own memory with it, and the memory of those about him. Jarchi restrains it to the book of Deuteronomy now before him:

but thou shalt meditate therein day and night;
whenever he had any leisure from the important business of his office, whether by day or night, see ( Psalms 1:2 ) ;

that thou mayest observe to do according to all that is written
therein;
which frequent speaking of it, and constant meditation on it, would lead unto:

for then thou shalt make thy way prosperous, and then thou shalt have
good success;
in his wars with the Canaanites.

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