At that time Yahweh said to Joshua, Make you flint knives, and circumcise again the children of Israel the second time.
With the completion of the circumcision, the people could celebrate the Passover (something that an uncircumcised person was not allowed to do; see Exodus 12:47-49). The journey from Egypt to Canaan was now officially over, and therefore the miraculous daily supply of manna ceased (10-12; cf. Exodus 16:35).