1. The Creator's Explicit Vocabulary
God uses the Hebrew word "Olam" (eternal/everlasting) specifically when describing the statutes of the Sinai Covenant (e.g., the Sabbath in Exodus 31:16 and the Festivals in Leviticus 23:14). If "eternal" meant "until a new religion starts," the Creator would be a deceptive communicator.
2. The Nature of Perfection
Psalm 19:7 states: "The Torah of YHWH is perfect (tamim), restoring the soul." Logically, if something is perfect, any change to it would make it imperfect. You cannot "improve" or "replace" perfection without degrading it.
3. The Prohibition of Alteration
Deuteronomy 12:32 (13:1 in Hebrew) commands: "Whatever I command you, be careful to observe it; you shall not add to it nor take away from it." Replacement theology requires both adding (new rituals like infant baptism) and taking away (discarding dietary laws/Sabbath). This violates the foundational "No-Change" clause of the Covenant.
4. The Definition of the "New Covenant"
In Jeremiah 31:33, the "New Covenant" is defined not as a new set of laws, but as the same Torah being placed inside the people.
"I will put My Torah in their minds and write it on their hearts." It is a change of location (from stone to heart), not a change of content.
5. The Immutability of God
Malachi 3:6 declares: "For I am YHWH, I do not change." If God established a Covenant as an "eternal sign" and then replaced it, He would have changed His mind, His standards, and His character.
6. The Sabbath as an "Eternal Sign"
In Exodus 31:17, the Sabbath is called a "sign between Me and the children of Israel forever." A sign that is replaced is no longer a sign. If the Sabbath is discarded, the "sign" of the Creator's authority is removed.
7. The Test of a True Prophet
Deuteronomy 13:1-4 warns that even if a prophet performs signs and wonders, if he tells you to follow a path other than the commandments given at Sinai, he is a false prophet. The Sinai Covenant is the only yardstick used to measure the truth of any future revelation.
8. The Duration of "All Generations"
Throughout the Torah (e.g., Exodus 12:14, Exodus 27:21), God specifies that these laws are for your descendants "throughout your generations." As long as generations of humans exist, the mandate remains active.
9. The Logic of the "Remnant"
In Micah 4:2 and Isaiah 2:3, the prophets describe the "End of Days." They state that in the future, all nations will go up to Jerusalem specifically so that God may "teach us His ways" and because "the Torah will go out from Zion." If the Law were replaced, it wouldn't be the center of the future Kingdom.
10. The Finality of the Witness
Psalm 119:160 sums it up: "The sum of Your word is truth, and every one of Your righteous ordinances is everlasting." Not "temporary until the Church Fathers arrive," but everlasting.