Why was the Sabbath instituted?

What follows is one scholar’s way of reading this disagreement — a critical-historical view that often concludes the texts genuinely disagree. It draws on the peer-reviewed sources listed below and stands as one position among the answers above, presented for transparency, not as GEBible’s position.

How critical scholarship weighs this: Widely regarded as a genuine contradiction

This summarizes where critical scholarship tends to land on this tension — a report on the field’s center of gravity, not GEBible’s own ruling.

The Sabbath commandment appears twice in the Pentateuch in nearly identical wording — Exodus 20:8-11 and Deuteronomy 5:12-15 — but the two versions supply mutually exclusive grounds for the same observance, and the divergence is one of the cleanest source-critical fingerprints in the Torah. Exodus 20:11 grounds the command cosmologically: "For in six days the LORD made heaven and earth … and rested the seventh day: wherefore (Hebrew 'al-kēn) the LORD blessed the sabbath day." That motive clause is verbally dependent on Genesis 2:2-3, where God completes creation, rests (Hebrew wayyišbōt, the verbal root of šabbāt), and sanctifies the seventh day — both texts assigned to the Priestly stratum (P). Deuteronomy 5:15 supplies an entirely different etiology: "And remember that thou wast a servant in the land of Egypt … therefore ('al-kēn) the LORD thy God commanded thee to keep the sabbath day." The Deuteronomic version even reworks the surrounding material to match: where Exodus motivates the rest of the slave by appeal to creation, Deuteronomy 5:14 inserts "that thy manservant and thy maidservant may rest as well as thou," turning the Sabbath into a social-justice institution rooted in the memory of bondage.

The two rationales are not two facets of a single argument; each is grammatically presented as THE reason God gave the command, marked by the same causal connector 'al-kēn. The Exodus Sabbath imitates God; the Deuteronomic Sabbath liberates the household. P's interest in cosmic order, the sanctification of time, and the sabbatical structure of creation runs through Genesis 1, the manna account in Exodus 16, and the festal calendars; D's interest in the Exodus deliverance, the humane treatment of slaves and aliens, and the leveling memory of servitude runs through Deuteronomy 15, 16, and 24. Each motive clause is at home in its own source's theological program, which is exactly what the Documentary Hypothesis predicts when a redactor preserves parallel traditions side by side without smoothing them into agreement.

The traditional harmonization, articulated by Gleason Archer, holds that a single commandment may rest on multiple compatible motives — God both rested at creation and redeemed Israel, so both clauses are true and complementary. In the abstract that is unobjectionable: motives are not zero-sum. But the harmonization does not engage the textual datum, which is not merely that two motives exist but that two transmitted versions of one verbatim law each assign a different single motive with the same causal particle. The question the contradiction poses is not "can God have two reasons" but "why does the same Decalogue, reproduced almost word for word, change the stated reason between Exodus and Deuteronomy." The most economical answer is that the two recensions descend from distinct literary traditions. Jewish interpreters noticed the tension early; the rabbinic tradition harmonized the parallel divergence over zākôr ("remember," Exod 20:8) versus šāmôr ("keep," Deut 5:12) by claiming both were spoken "in a single utterance" (b. Šebuʿot 20b, Rosh Hashanah 27a) — a device that concedes the surface difference precisely by appealing to miracle. Tigay, Weinfeld, and Propp all treat the Exodus/Deuteronomy motive divergence as a textbook example of competing Pentateuchal traditions, with Weinfeld emphasizing the characteristically Deuteronomic humanitarian recasting and Childs noting that the Deuteronomist deliberately substituted the historical for the creational ground. Friedman assigns Exodus 20:11 to P and the Deuteronomic frame to D, and the verbal dependence of Exodus 20:11 on the P creation account confirms the stratification.

Where the critical reading lands: genuine contradiction at the level of stated rationale, cleanly explained by source criticism; the multiple-motive harmonization is true in principle but does not account for the textual change of motive within a verbatim-repeated law.