The Meaning of Numbers: The Number 70
Seventy has a sacred meaning in the Bible that is made up of the factors of two perfect numbers, seven (representing perfection) and ten (representing completeness and God's law). As such, it symbolizes perfect spiritual order carried out with all power. It can also represent a period of judgment.
70 elders were appointed by Moses (Numbers 11:16). After reading the covenant God gave him to read to the people, Moses took 70 elders, along with Aaron and his sons, up Mount Sinai to have a special meal with God himself (Exodus 24:9 - 11)!
Ancient Israel spent a total number of 70 years in captivity in Babylon (Jeremiah 29:10).
Seventy is also specially connected with Jerusalem. The city kept 70 years of Sabbaths while Judah was in Babylonian captivity (Jeremiah 25:11). Seventy sevens (490 years) were determined upon Jerusalem for it to complete its transgressions, to make an end for sins and for everlasting righteousness to enter into it (Daniel 9:24).
Appearances of the number seventy
Terah, the father of Abraham (who was not his oldest son), had his first male child at seventy. Cainan, the fourth Biblical patriarch mentioned in scripture, had his first son at the age of 70.
Israel in Egypt had its beginnings with Joseph rising in power in Pharaoh's court and Jacob migrating his entire household into the land. A total of 70 Israelites started a nation WITHIN another nation that would grow to more than two million by the Exodus.