The Amenemhet III pyramid at Hawara showing the mudbricks of the inner core, the limestone blocks that were part of the external veneer and the considerable erosion that has occured over the centuries. This was the last of the Great Pyramids of Egypt. The Israelites were slaves in Egypt during the 12th dynasty when this pyramid was made. Moses was brought up by Amenemhet III. It is quite likely that the millions of mudbricks that went into building this pyramid were made by the Israelites. When the exodus occured, there was not enough slave labour to make pyramids anymore and so the pyramid age ended. Erosion of the inner core of mudbricks may have been what caused the limestone veneer to collapse. The pyramids of the Old Kingdom which were made of solid limestone have stood the test of time much better.