Tractate Meilah - Chapter 2 - Mishnah 5 מעילה פרק ב׳ משנה ה׳

The law of sacrilege applies to the hatat, and asham and to shelamim sacrifices of the congregation from the moment of their dedication. Once slaughtered they become susceptible to be disqualified through contact with a tevul yom or one who still requires atonement, or by remaining overnight. Once their blood has been sprinkled they are subject to [the laws of] piggul, notar and defilement. The law of sacrilege then no longer applies to the flesh, but applies to the innards until the ashes are removed to the place of the ashes.