What did turtle say to sandy when she rode up on her bike The Westing game?

In "The Westing Game," Turtle sarcastically asks Sandy if the "walls of Jericho" have fallen down when she sees him riding up on his bike. This is a reference to the biblical story where the walls of Jericho fell after the Israelites marched around the city. Turtle's comment is a playful way of teasing Sandy.