Joshua 2:18
Behold, when we come into the land, thou shalt bind this line of scarlet thread in the window which thou didst let us down by: and thou shalt bring thy father, and thy mother, and thy brethren, and all thy father’s household, home unto thee.
Cross-reference
In Joshua 2:13, Rahab requests safety for her family; the spies then give the scarlet cord as the condition for that protection.
In Joshua 2:21, Rahab ties the scarlet cord as instructed, directly responding to the spies' command.
Joshua 2:12 contains Rahab's request for her family's safety—verse 18 directly answers that plea with the scarlet cord instruction; the prior verse sets up the entire sign.
In Joshua 6:23, the spies rescue Rahab and her family, fulfilling the promise associated with the scarlet cord.
In Genesis 7:1, Noah's family enters the ark for salvation from the flood—like Rahab's household saved by the scarlet cord—a household delivered through a sign of faith.
In Genesis 19:12-17, Lot and his family are rescued from Sodom's destruction—same pattern of a righteous household spared through a warning and a sign.
In Luke 19:9, Jesus declares salvation has come to Zacchaeus's house—matching Rahab's household being saved, both sinners receiving grace and becoming part of God's people.
Acts 11:14 says Cornelius's household would be saved through Peter's words—direct parallel: a Gentile household saved by a sign/message, just as Rahab's was saved by the scarlet cord.
In Ezekiel 9:6, a mark on the forehead spares the righteous from judgment, paralleling the scarlet cord as a sign of deliverance from destruction.
In 2 Corinthians 11:33, Paul's escape through a window in a basket mirrors the spies' escape through Rahab's window, both deliverances from danger.