What is the commandment to fulfill oaths (shevuat emet) in Deuteronomy 23:23?

Deuteronomy 23:23 commands that whatever goes out of your lips — specifically a freely offered oath — must be kept and performed. The phrase "gone out of thy lips" establishes that the spoken word creates an obligation that cannot be privately revised.

How does Psalm 15:4 describe the person who keeps oaths?

Psalm 15:4 identifies the righteous person as one who "sweareth to his own hurt, and changeth not" — meaning they keep oaths even when doing so becomes costly or inconvenient. This is presented as a defining characteristic of someone worthy to "abide in God's tabernacle."

How did Rahab's oath with the Israelite spies illustrate this commandment?

In Joshua 2, Rahab negotiated a sworn oath of protection for her household. When Jericho fell in Joshua 6, Joshua commanded the two spies to fulfill what they had sworn. Both parties honored the oath — the spies kept their word despite the military context and Rahab's status as a Canaanite.

Why did Joshua's leaders have to honor the Gibeonite treaty even though it was obtained by deception?

According to Joshua 9:19, the oath had been sworn by the LORD's name and therefore could not be revoked even after the deception was discovered. The binding element was not the other party's honesty but the invoking of God's name in the oath itself.

What were the consequences when King Saul broke the Gibeonite oath?

2 Samuel 21:1-9 records that a three-year famine fell on Israel during David's reign because Saul had broken the oath made to the Gibeonites in Joshua 9. David investigated the cause, discovered Saul's violation, and made restitution. The oath's consequences extended across generations.

Commandment #117 · Positive · Temple & Worship

Let Your Yes Be Yes: The Commandment to Keep Every Oath

שְׁבוּעַת אֱמֶת

Source: Deuteronomy 23:23 · Maimonides, Sefer HaMitzvot, Positive #117

A vow dedicated an object to God. An oath bound a person's actions. "I swear I will do this." "I swear I have done that." The Torah commanded that every oath — not only the convenient ones, not only those sworn in easy circumstances — be kept. The integrity of a society depended on the word of its members remaining reliable.

Words That Bind

מוֹצָא שְׂפָתֶיךָ תִּשְׁמֹר וְעָשִׂיתָ כַּאֲשֶׁר נָדַרְתָּ לַיהוָה אֱלֹהֶיךָ נְדָבָה אֲשֶׁר דִּבַּרְתָּ בְּפִיךָ

"That which is gone out of thy lips thou shalt keep and perform; even a freewill offering, according as thou hast vowed unto the LORD thy God, which thou hast promised with thy mouth."

Deuteronomy 23:23 — Open in Torah Reader

The phrase "gone out of thy lips" is physical. An oath was not a thought or an intention — it was spoken, it was in the air, it was heard by other people and by God. Once spoken, it could not be recalled. It could only be honored. The commandment did not allow for internal revision or private renegotiation. The spoken word created an obligation that existed independently of whether the speaker still felt like fulfilling it.

נִבְזֶה בְּעֵינָיו נִמְאָס וְאֶת יִרְאֵי יְהוָה יְכַבֵּד נִשְׁבַּע לְהָרַע וְלֹא יָמִר

"In whose eyes a vile person is contemned; but he honoureth them that fear the LORD. He that sweareth to his own hurt, and changeth not."

Psalm 15:4 — Open in Torah Reader

The psalm's description of the person who may "abide in thy tabernacle" includes this portrait: one who "sweareth to his own hurt, and changeth not." The test of an oath is not the moment it is convenient — it is the moment keeping it costs something. The righteous person in Psalm 15 is defined partly by the fact that they keep oaths even when doing so is against their interest.

Rahab's Oath — Both Parties Kept It

When the two spies entered Jericho, Rahab hid them and negotiated an oath: Joshua 2:12-13: "Now therefore, I pray you, swear unto me by the LORD, since I have shewed you kindness, that ye will also shew kindness unto my father's house." The spies swore. The scarlet cord would mark her window.

When Jericho fell, Joshua 6:22-25 records that Joshua commanded the two men to fulfill what they had sworn. Rahab and her household were brought out alive before the city was burned. The oath made in secret was kept in the most public possible setting — the moment an entire city fell. The warriors who had just conquered Jericho stopped to honor a promise made to one woman in a wall.

The Gibeonite Covenant — Four Hundred Years of a Kept Oath

The Gibeonites deceived Joshua's leaders into swearing an oath of peace, pretending to be travelers from a distant land. When the deception was discovered, the leaders could not revoke the oath: Joshua 9:19: "But all the princes said unto all the congregation, We have sworn unto them by the LORD God of Israel: now therefore we may not touch them."

The oath was kept even though it had been obtained by fraud — because it had been sworn by the LORD's name, not merely by human commitment. Centuries later, Saul violated the oath (2 Samuel 21:1-2) and three years of famine fell on Israel during David's reign. David investigated, discovered the cause, and made restitution to the Gibeonites. The oath's reach extended four hundred years. That is what keeping oaths means when God's name is involved.

Key Figures

Rahab — Who Extracted an Oath From Israel's Spies and Both Parties Honored It

In Joshua 2, Rahab negotiated a sworn protection for her household before hiding the spies. In Joshua 6:22-25, Joshua commanded its fulfillment even as Jericho burned. The oath held across the conquest, across the city's destruction, and across the transition from intelligence mission to military victory. Both the spies and their general kept a word sworn in secret.

The Gibeonite Covenant — An Oath Honored Long After Joshua Had Sworn It

The Gibeonite treaty in Joshua 9:15-19 was obtained by deception, but it had been sworn by the LORD's name and could not be revoked. When Saul broke it and David had to make restitution (2 Samuel 21:1-9), the story showed that oaths sworn under God's name carried consequences that outlasted the people who had sworn them.

Study Questions

For reflection and group study

Psalm 15:4 describes the righteous person as one who "sweareth to his own hurt, and changeth not." What does this definition of integrity imply about the nature of oaths? If oaths were only kept when convenient, what function would they actually serve?

Rahab's oath was kept even though she was a Canaanite, an enemy national, and a woman whose profession made her an unlikely recipient of an Israelite legal commitment. What does the fact that the oath was kept regardless of who she was suggest about how the Torah understood the binding nature of an oath?

The Gibeonite oath was obtained by deception, yet the leaders held that it could not be broken because it had been "sworn by the LORD." Is this a flaw in the oath system or a feature? What would it mean for the entire system if oaths could be revoked when the other party had acted dishonestly?

Saul broke the Gibeonite oath hundreds of years after Joshua swore it, and three years of famine followed. David had nothing to do with the original oath or its breaking, yet the consequences fell in his reign. What does this intergenerational consequence suggest about the Torah's understanding of national covenants and collective obligation?

Matthew 5:33-37 instructs: "swear not at all... but let your communication be, Yea, yea; Nay, nay." How does this teaching relate to the Torah's commandment to fulfill oaths? Is it a rejection of the oath system, an intensification of it, or something else?

The Gibeonite covenant shows how seriously the Torah took sworn obligations — an oath sworn by God's name could not be revoked even four hundred years later.

Open Deuteronomy 23:23 in Torah Reader

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