Deuteronomy 10:20

10:20 Revere the Lord your God, serve him, be loyal to him and take oaths only in his name.

Deuteronomy 11:16

Exhortation to Instruction and Obedience

11:16 Make sure you do not turn away to serve and worship other gods! ¹ 

[11:16]  ¹ tn Heb “Watch yourselves lest your heart turns and you turn aside and serve other gods and bow down to them.”