So Joseph made the Israelites swear, saying, “When God comes to you, you shall carry up my bones from here.”
And Joseph died, being one hundred ten years old; he was embalmed and placed in a coffin in Egypt.
We learn that Joseph's bones were later brought out of Egypt by Moshe Rabeinu (according to Shemos) and/or the B'nei Yisroel (according to Yehoshua), resulting in the fulfillment of the covenant. But why didn't Joseph's brothers themselves bring his bones out of Egypt, according to his last wishes and their own promise? Are all of Joseph's brothers guilty of a significant aveiro through their failure to do this?