Charles Spurgeon Commentary Exodus 12:10

"And ye shall let nothing of it remain until the morning; but that which remaineth of it until the morning ye shall burn with fire." — Exodus 12:10 (ASV)

And ye shall let nothing of it remain until the morning; and that which remaineth of it until the morning ye shall burn with fire.

Not a bone was to be left for the Egyptians to treat with dishonour, but all was to be consumed.