“the tenth day of the first month.” The tenth day of the first month, Nisan, is the day that the Passover lamb is selected (Exod. 12:3). That means it had been almost 40 years to the day that Israel left Egypt, because they left on Nisan 15, 40 years before (Exod. 12:29-40).

“on the east side of Jericho.” No evidence for this camp has ever been found.