And it came to pass at the end of three days after they had made a league with them, that they heard that they were their neighbours, and that they dwelt among them. At the end of three days - Gibeon is reputed to be only about eight leagues distant from Gilgal, and on this account the fraud might be easily discovered in the time mentioned above.
Related Commentaries of Joshua 9:16
Joshua 9:16
16 And it came to pass at the end of three days after they had made a league with them, that they heard that they were their neighbours, and that they dwelt among them.