In the Bible, the numbers seven and three speak of completion and perfection, among eternal revelation regarding these numbers.

Seven Covenants; and every one has three conditions – one covenant with three people: Abraham, Isaac and Jacob
Seven stations in the tabernacle; in three sections
Seven Feasts; in three seasons
Jesus shed His blood seven times; in three “groups”:
1. Four times before the cross
2. Twice on the cross before He died
3. Once after He died
7,000 Years of Human history; in three eras:
1. 4,000 years from Adam to Jesus
2. 2,000 years from Jesus to the Millenium
3. The Millenium