Deuteronomy 6:14

“Ye shall not go after other gods, etc.] To serve and worship them, and swear by them; and which indeed are no gods, only nominal and fictitious ones; idols which are nothing in the world, and ought to have no veneration and adoration given them; to go after them is to worship them, and this is to depart from the true God, and go a whoring after false deities: of the gods of the people which are round about you; the gods of the Edomites, Ammonites, Moabites, Philistines, and Egyptians; all of which had their peculiar deities.”

“The Israelites were at the point of quitting a normal, life for a fixed and settled abode in the midst of other nations; they were exchanging a condition of comparative poverty for great and goodly cities, houses and vineyards. There was therefore before them a double danger; (1) a God-forgetting worldliness, and (2) a false tolerance of the idolatries practiced by those about to become their neighbors. The former error Moses strives to guard against in the verses before us; the latter in Deuteronomy 7:1-11. Deuteronomy 6:13 The command “to swear by His Name” is not inconsistent with the Lord’s injunction Matthew 5:34, “Swear not at all.” Moses refers to legal swearing, our Lord to swearing…”

“not go: Deu 8:19, Deu 11:28; Exo 34:14-16; Jer 25:6; Jo1 5:21 of the gods: Deu 13:7 Deuteronomy 6:15”

“The worship of Jehovah not only precludes all idolatry, which the Lord, as a jealous God, will not endure (see at Exo 20:5), but will punish with destruction from the earth ("the face of the ground," as in Exo 32:12); but it also excludes tempting the Lord by an unbelieving murmuring against God, if He does not remove any kind of distress immediately, as the people had already sinned at Massah, i.e., at Rephidim ( Exo 17:1-7). Deuteronomy 6:17”