Ye shall let nothing of it remain till the morning. The whole of the flesh was to be consumed by the guests, and at one sitting, lest there should be any even accidental profanation of the food by man or animal, if part were put away.
The English Church, acting on the same principle of careful reverence, declines to allow any reservation of the Eucharistic elements, requiring the whole of the consecrated bread and wine to be consumed by the Priest and communicants in the Church immediately after the service.
That which remaineth—i.e; the bones, and any small fragments of the flesh necessarily adhering to them. Ye shall burn with fire. Thus only could its complete disappearance, and seeming annihilation be secured.
It does not appear that this burning was viewed as a sacrificial act.