Rahab helped

Rahab helped the spies of Joshua by keeping them safe from the king of Jericho. They promised that they would save her and her family when the Israelites conquered Jericho, if she would tie a scarlet cord in the window through which she let them escape and all her family remained in the same room with her.

Because of the help of Rahab, Joshua knew what was to come and that God was in control.

Rahab’s actions led her to become part of the family tree of Jesus and great-great-grandmother of King David, after she married Salmon. They had a son called Boaz, who married Ruth.

Ruth later became Jesus’ great-grandmother.

In helping the spies, Rahab betrayed her own city and people. She and all her family would have been killed, if the king of Jericho had found
out.

Background reading:

Rachav

Behold, when we come into the land, you shall bind this scarlet cord in the window through which you let us down; and you shall gather into your house your father and mother, your brothers, and all your father’s household.
Joshua 2:18