John Gill Commentary Leviticus 7:17

"but that which remaineth of the flesh of the sacrifice on the third day shall be burnt with fire." — Leviticus 7:17 (ASV)

But the remainder of the flesh of the sacrifice on the third day What remained of it uneaten on the second day, and was kept till the third:

shall be burnt with fire ; that it might neither corrupt, nor be put to superstitious uses, nor be of any profit in any respect; that so niggardliness and distrust of the care of Providence might be discouraged: perhaps some respect may be had in the type to the resurrection of Christ on the third day, having seen no corruption.