Text: Genesis 50:24-25 - "And Joseph said unto his brethren, I die: and God will surely visit you, and bring you out of this land unto the land which He sware to Abraham, to Isaac, and to Jacob. And Joseph took an oath of the children of Israel, saying, God will surely visit you, and ye shall carry up my bones from hence."
Joseph's family was still in Egypt when he died. He knew they would not be there for ever. But it came to a place and time (400 years later) when they had accomplished all that could be done in Egypt. It was time for them to go to "the promise!" You'd think that the promise was something they should have rushed toward - ASAP! But it was necessary that they go through the wilderness "school" before they were fit (prepared) for the promise.
Stuff had to be purged (burnt out). Stuff had to be laid aside (laid down). Stuff had to be pruned (cut off). It was necessary for Israel to learn patience as thy waited for God to bring them to the promise. They had to learn - it's not me, but it's US!