Genesis 47:22

‘Only the land of the priests he did not buy. For the priests had a portion from Pharaoh and ate their portion which Pharaoh gave them, and for that reason they did not sell their land.'

The priests were powerful and influential. Furthermore they were provided with their food by Pharaoh. Thus they did not need to sell their land and remained semi-independent. We know that in the later so-called New Kingdom this was so. The extensive Temple lands were not formally included in Pharaoh's right of possession. This is further support for the view that this was not under the Hyksos. They would not have given such benefits to the priests who were opposed to them, the priests of Re and Atum.