What does 'when I see the blood, I will pass over you' mean?

This phrase, originating from the Passover in Exodus 12, embodies the assurance that God provides to His people through the blood of the Lamb. When God sees the blood, it denotes that His wrath and judgment will not fall upon those covered by it. In the New Testament context, this implies that believers who are covered by the blood of Jesus are safeguarded from the ultimate judgment of sin, and it provides them with a clear passage into God's presence (1 Corinthians 5:7). Thus, it symbolizes the complete safety and acceptance afforded to God's elect through faith in Christ's atoning sacrifice.