|Positive Mitzvah Seventy
The Suspensive Asham-offering
Requires Beit HaMikdash
We are commanded to offer a certain sacrifice in case of doubt about one of these major sins for which the penalty is extinction if committed willfully, and a fixed Chataat-offering if committed unintentionally. This sacrifice is called a Suspensive Asham-offering.
An example of a case of doubt which calls for a Suspensive Asham-offering - Suppose a person has before him two pieces of fat, one being fat of the kidneys [which is forbidden food according to Torah], and the other fat of the heart [permitted food according to Torah]. He eats one of the two, and the other is eaten by another person or lost. A doubt then arises in his mind whether the piece he has eaten was the permitted or the forbidden one. In such a case he must offer a sacrifice because of the doubt that has arisen, so as to get atonement, and this is called a Suspensive Asham-offering. If it is subsequently established that the piece he ate was the fat of the kidneys, it s confirmed that he as sinned unintentionally, and must offer a fixed Chataat-offering.
A wider application of this Mitzvah:
"They told of Bab b. Buta that he offered of his own free will a Suspensive Asham-offering every day save only the day after Yom Kippur. He said, 'By this Temple! Has they allowed me, I would have offered one even then, but they said to me, 'Wait until you have come to a state of doubt.'" (Ker. 25a)