Deuteronomy 6:13

“Thou shalt fear the Lord thy God, and serve him, etc.] Serve him through fear; not through slavish fear, a fear of hell and damnation; but through filial fear, a reverential affection for that God that had brought them out of a state of bondage into great and glorious liberty, out of Egypt into Canaan’s land, out of a place of misery into a land of plenty; and therefore should fear the Lord and his goodness, and from such a fear of him serve him, in every part of worship, public and private, enjoined; this passage Christ refers to (<400410>Matthew 4:10) and shalt swear by his name; when they made a covenant with any, or were called to bear a testimony for the decision of any controversy…”

“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…”

“Shalt swear by his name - When thou hast a call and just cause to swear, not by idols, or any creatures. Deuteronomy 6:15”

“6:13 Jesus quoted this verse when tempted by Satan (Matt 4:10; Luke 4:8).”

“fear: Deu 6:2, Deu 5:29, Deu 10:12, Deu 10:20, Deu 13:4; Mat 4:10; Luk 4:8 and serve him: Our Saviour quotes these words thus: "And him only (αυτω μονω), shalt thou serve;" from which it would appear, that the word levaddo was anciently in the Hebrew Text, as it was in the Septuagint, Coptic, Vulgate (illi soli), and Anglo-Saxon. Dr. Kennicott argues that without the word only, the text would not have conclusive for the purpose for which our Lord advanced it. It is proper, however, to observe, that the word levaddo is not found in any manuscript yet collated, though retained in the above versions. shalt swear: Lev 19:12; Jos 2:12; Psa 15:4, Psa 63:11; Isa 45:23, Isa 65:16; Jer 4:2, Jer 5:2,…”