Joshua 23:11

9 For the LORD hath driven out from before you great nations and strong: but as for you, no man hath been able to stand before you unto this day.

10 One man of you shall chase a thousand: for the LORD your God, he it is that fighteth for you, as he hath promised you.

Take good heed therefore unto yourselves, that ye love the LORD your God.

12 Else if ye do in any wise go back, and cleave unto the remnant of these nations, even these that remain among you, and shall make marriages with them, and go in unto them, and they to you:

13 Know for a certainty that the LORD your God will no more drive out any of these nations from before you; but they shall be snares and traps unto you, and scourges in your sides, and thorns in your eyes, until ye perish from off this good land which the LORD your God hath given you.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
Therefore watch yourselves carefully, that you love the LORD your God.
KJV
Take good heed therefore unto yourselves, that ye love the LORD your God.
WEB
Take good heed therefore to yourselves, that you love the LORD your God.
ASV
Take good heed therefore unto yourselves, that ye love Jehovah your God.
DARBY
Take great heed therefore unto your souls, that ye love Jehovah your God.
BLB
And exceedingly take heed to yourselves that you love YHWH your⁺ God.
ÅB
Ta dere da nøye i vare, så sant dere har deres liv kjært, og elsk Herren deres Gud!
OTB
Så ta dere nøye i akt for å elske Herren deres Gud.
B1930
Ta eder da nøie i vare, så sant I har eders liv kjært, og elsk Herren eders Gud!

Study notes (Tyndale)

Original text and word study

Cross references