Sin: Sin at the door—"Sin lieth at the door" (Genesis 4:7).

Substitution: Blood on the door—"Take of the blood, and strike it on the two side posts and on the upper door post of the houses" (Exodus 12:7).

Salvation: Passing over the door—"The Lord will pass over the door" (Exodus 12:23).

Security: Preserved behind the door—"The door of the ark … the Lord shut him in" (Genesis 6:16;7:16).

Sanctification: Nailed to the door—"Bring him to the door" (Exodus 21:6).

Sentry: Sentinel at the door—"Keep the door of my lips" (Psalm 141:3).

Station: Looking for the Lord—"Waiting at the posts of My doors" (Proverbs 8:34).

—From 500 Bible Readings by F.E. Marsh.