Deuteronomy 6:11-13

11and houses full of all good things which you did not fill, and hewn (excavated) cisterns (wells) which you did not dig out, and vineyards and olive trees which you did not plant, and you eat and are full and satisfied,

12then beware that you do not forget the Lord who brought you out of the land of Egypt, out of the house of slavery.

13You shall fear [only] the Lord your God; and you shall serve Him [with awe-filled reverence and profound respect] and swear [oaths] by His name [alone].