An animal sacrifice must be made with six intentions: that it is offered as a sacrifice; that it is on behalf of the donor; that it is for God; that it is a fire offering; that it is to produce a smell; that it be pleasing [to God]. [If the sacrifice is] a purification or guilt offering, then it should [also] be intended [to purify] for the sin. Rabbi Yose says, even if someone offered the sacrifice without one of these intentions it is still valid, for it is a decree of the court that intention is implied by the action.
Although the Mishnah was edited about 130 years after the Temple was destroyed, the sacrificial system loomed large in rabbinic consciousness. This mishnah is interesting for its attention to the state of mind of a sacrificial donor. Ideally, the donor must keep all six intentions for his sacrifice, but after the fact, the deed itself testifies to his good intentions.