Genesis 37:2

Now Joseph was thirty years old when he stood before Pharaoh, king of Egypt. And Joseph went out from the presence of Pharaoh and passed through all the land of Egypt.

But Joseph recognized his brothers, although they did not recognize him.

“For the famine has been in the land these two years, and there are still five years in which there will be neither plowing nor harvesting.

then you shall say, ‘Your servants have been keepers of livestock from our youth and until now, both we and our fathers,’ that you may live in the land of Goshen; for every shepherd is an abomination to the Egyptians.”