Psalms 81:9

7 You called out in distress, and I rescued you; I answered you from the cloud of thunder; I tested you at the waters of Meribah. Selah

8 Hear, O My people, and I will warn you: O Israel, if only you would listen to Me!

There must be no strange god among you, nor shall you bow to a foreign god.

10 I am the LORD your God, who brought you up out of Egypt. Open wide your mouth, and I will fill it.

11 But My people would not listen to Me, and Israel would not obey Me.

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

Compare

BSB
There must be no strange god among you, nor shall you bow to a foreign god.
KJV
There shall no strange god be in thee; neither shalt thou worship any strange god.
WEB
There shall be no strange god in you, neither shall you worship any foreign god.
ASV
There shall no strange god be in thee; Neither shalt thou worship any foreign god.
DARBY
There shall no strange God be in thee, neither shalt thou worship any foreign God.
BLB
There shall not be among you a strange god, and you shall not bow down to foreign god.
ÅB
Det skal ikke være noen fremmed gud hos deg, og du skal ikke tilbe utlendingens gud.
OTB
La det ikke være noen fremmed gud blant deg;
Du skal ikke bøye deg for en fremmed gud.
B1930
Det skal ikke være nogen fremmed gud hos dig, og du skal ikke tilbede utlendingens gud.

Study notes (Tyndale)

Original text and word study

Cross references