Based on Hebrews 9:27, all mankind must appear before God. Believers at the Bema Seat, Unbelievers at the Great White Throne. BEFORE this life is over, believers should have an appointment daily with God in prayer, unbelievers Revelation 22:17 - COME.
Read Hebrews 9:19-28
V19 Moses had been given the Law by God and he (Moses) related that to the people.
Moses also made a symbolic gesture of sprinkling blood (Mercy Seat).
V20 “This is the blood of the testament”
No Testament (will) was in effect until death