The number 70 in Scripture represents universality, complete jurisdiction, and the fullness of God's dealings with humanity. It appears at every major juncture in the biblical narrative where God addresses the totality of nations, peoples, or time.
70 Nations of Genesis 10
Genesis 10 — the "Table of Nations" — lists exactly 70 descendants of Noah who became the fathers of all the nations of the earth. In Jewish tradition, these represent the 70 original nations — the complete human family. When Scripture speaks of "all nations," it speaks in the language of 70.
70 Souls in Egypt
When Jacob's family descended to Egypt, they numbered exactly 70 souls (Genesis 46:27; Exodus 1:5). The entire nation of Israel began as 70 — a microcosm of all nations, set apart from all nations, to bless all nations.
70 Elders
Moses appointed 70 elders to help govern Israel (Numbers 11:16-25). The Sanhedrin, the supreme Jewish council, maintained 70 members (plus the high priest = 71). Seventy is the number of complete governmental representation.
70 Years of Exile
Jeremiah prophesied that Israel's Babylonian exile would last 70 years (Jeremiah 25:11-12; 29:10). Daniel's prayer in Daniel 9 was prompted by his reading of this 70-year prophecy — his realization that the time was nearly complete. Seventy years of exile = the full measure of judgment for the land's unpaid Sabbaths (2 Chronicles 36:21).
70 Sent by Jesus
In Luke 10:1, Jesus sent out 70 disciples (some manuscripts read 72) into every city He was about to enter. If the 12 apostles represent the government of the new Israel, the 70 represent the mission to all nations. Seventy disciples for 70 nations.
The Prophetic Significance
When 70 appears, God is addressing the totality — all nations, all time, the complete scope of His jurisdictional purpose. It is the macro number, the big-picture number, the number that says: "This concerns everyone, everywhere."