Why were the Jews safe from the death angel on Passover?
The Jews were safe from the death angel on Passover for one reason: the blood was on the door. While wailing sounded across Egypt, that blood secured them. This illustrates safety, just as Noah's family was safe in the pitch-lined ark, and believers are safe in Christ.
Les explains that on Passover night the Jews were at the kitchen table ready to eat the Passover lamb while the death angel was at work and wailing was already sounding across Egypt. They were safe and secure for one reason: the blood was on the door. He parallels this with Noah and his family in the ark; the flood was demolishing everything on the planet, but Noah and his family were safe because the wooden ark had been lined with pitch, and pitch in Hebrew meant atonement. In the same way, Les teaches, the believer is positioned in Christ and in God, hid in God and in Christ, a glorious, safe, secure place nothing can touch. Paul says not to worry about the one who can destroy the body but cannot destroy the soul.