Footnotes:

1. 19:13 May they go up on the mountain: in vv. 12–13a, a later Priestly reshaping of an earlier version of the instructions governing how the people are to prepare for the encounter with God (vv. 10–11, 13b), the people are to be restrained from ascending the mountain, which is suffused with the holiness of God and too dangerous for their approach. In the earlier version, as v. 13b suggests, the sanctified people must come near, in order to hear God speaking with Moses (v. 9) and in this way receive confirmation of his special relationship with God.
2. 19:16 Shofar: a ram’s horn used like a trumpet for signaling both for liturgical and military purposes.
3. 19:20–25 At this point the Priestly additions of vv. 12–13a are elaborated with further Priestly instructions, which include the priests’ sanctifying themselves apart from the people (v. 22) and Aaron accompanying Moses to the top of the mountain (v. 24).
4. 20:1–17

   The precise numbering and division of these precepts into “ten commandments” is somewhat uncertain. Traditionally among Catholics and Lutherans vv. 1–6 are considered as only one commandment, and v. 17 as two. The Anglican, Greek Orthodox, and Reformed churches count vv. 1–6 as two, and v. 17 as one. Cf. Dt 5:6–21. The traditional designation as “ten” is not found here but in 34:28 (and also Dt 4:13 and 10:4), where these precepts are alluded to literally as “the ten words.” That they were originally written on two tablets appears in Ex 32:15–16; 34:28–29; Dt 4:13; 10:2–4.

   The present form of the commands is a product of a long development, as is clear from the fact that the individual precepts vary considerably in length and from the slightly different formulation of Dt 5:6–21 (see especially vv. 12–15 and 21). Indeed they represent a mature formulation of a traditional morality. Why this specific selection of commands should be set apart is not entirely clear. None of them is unique in the Old Testament and all of the laws which follow are also from God and equally binding on the Israelites. Even so, this collection represents a privileged expression of God’s moral demands on Israel and is here set apart from the others as a direct, unmediated communication of God to the Israelites and the basis of the covenant being concluded on Sinai.

5. 20:3

   Beside me: this commandment is traditionally understood as an outright denial of the existence of other gods except the God of Israel; however, in the context of the more general prohibitions in vv. 4–5, v. 3 is, more precisely, God’s demand for Israel’s exclusive worship and allegiance.

   The Hebrew phrase underlying the translation “beside me” is, nonetheless, problematic and has been variously translated, e.g., “except me,” “in addition to me,” “in preference to me,” “in defiance of me,” and “in front of me” or “before my face.” The latter translation, with its concrete, spatial nuances, has suggested to some that the prohibition once sought to exclude from the Lord’s sanctuary the cult images or idols of other gods, such as the asherah, or stylized sacred tree of life, associated with the Canaanite goddess Asherah (34:13). Over the course of time, as vv. 4–5 suggest, the original scope of v. 3 was expanded.

6. 20:4 Or a likeness of anything: compare this formulation to that found in Dt 5:8, which understands this phrase and the following phrases as specifications of the prohibited idol (Hebrew pesel), which usually refers to an image that is carved or hewn rather than cast.
7. 20:5 Jealous: demanding exclusive allegiance. Inflicting punishment…the third and fourth generation: the intended emphasis is on God’s mercy by the contrast between punishment and mercy (“to the thousandth generation”—v. 6). Other Old Testament texts repudiate the idea of punishment devolving on later generations (cf. Dt 24:16; Jer 31:29–30; Ez 18:2–4). Yet it is known that later generations may suffer the punishing effects of sins of earlier generations, but not the guilt.
8. 20:7 In vain: i.e., to no good purpose, a general framing of the prohibition which includes swearing falsely, especially in the context of a legal proceeding, but also goes beyond it (cf. Lv 24:16; Prv 30:8–9).
9. 20:8 Keep it holy: i.e., to set it apart from the other days of the week, in part, as the following verse explains, by not doing work that is ordinarily done in the course of a week. The special importance of this command can be seen in the fact that, together with vv. 9–11, it represents the longest of the Decalogue’s precepts.
10. 20:11 Here, in a formulation which reflects Priestly theology, the veneration of the sabbath is grounded in God’s own hallowing of the sabbath in creation. Compare 31:13; Dt 5:15.
11. 20:12–17 The Decalogue falls into two parts: the preceding precepts refer to God, the following refer primarily to one’s fellow Israelites.
12. 20:13 Kill: as frequent instances of killing in the context of war or certain crimes (see vv. 12–18) demonstrate in the Old Testament, not all killing comes within the scope of the commandment. For this reason, the Hebrew verb translated here as “kill” is often understood as “murder,” although it is in fact used in the Old Testament at times for unintentional acts of killing (e.g., Dt 4:41; Jos 20:3) and for legally sanctioned killing (Nm 35:30). The term may originally have designated any killing of another Israelite, including acts of manslaughter, for which the victim’s kin could exact vengeance. In the present context, it denotes the killing of one Israelite by another, motivated by hatred or the like (Nm 35:20; cf. Hos 6:9).