Joshua 1 8
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.
Compare with other 3 random translations
NLT Joshua 1:8Study 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.
EAS Joshua 1:8You must keep on speaking about the words of God's law. Think about what it says, all the time. Be careful to obey it. Then you will do well, and you will win.
AMP Joshua 1:8This Book of the Law shall not depart from your mouth, but you shall read [and meditate on] it day and night, so that you may be careful to do [everything] in accordance with all that is written in it; for then you will make your way prosperous, and then you will be successful.