Halakhah su Levitico 5:2

And it is written about impurity of the Temple and its consecrated foods (Leviticus 5:2), "Or a soul that touches anything impure, etc. and it was hidden from him"; and it is stated about it all at the end of the matter (Leviticus 5:6), "And he shall bring his guilt-offering." And the verse does not come explicitly that the liability of the impure one there would be with his entering the Temple or with his eating consecrated meat. Rather, we have understood from the tradition that it speaks about this (Shevuot 6b). And even though the thing is from the tradition, we have found the liability for excision for one who ate consecrated [food] or entered the Temple explicit in another place, as it is stated (Leviticus 7:20), "And the soul that eats meat from the sacrifice of the peace-offering that is to the Lord and his impurity is upon him, he shall be excised"; and another verse (Numbers 19:20) states about the impure one that enters the Temple, "for the Temple of the Lord he has made impure, and he shall be excised." And once excision has been written about its volitional transgression, there is a sacrifice for its inadvertent transgression - with our rule, that everything that is with excision for its volitional transgression, is with a sin-offering for its inadvertent transgression. And it is written about an oath of expression (Leviticus 5:4-6), "Or if a soul swears to express with his lips, etc. and it was hidden from him, etc. And he shall bring his guilt-offering." And from where [do we know] that the liability there [for them] is with a sacrifice that varies up and down? As it is written in the section (Leviticus 5:11), "And if his hand does not reach, etc."

And the side of exemption is (for example,) that he became impure and he did not know that he became impure and he entered the Temple or ate consecrated meat, and afterwards it became known to him that he had become impure. In this manner, he is exempt from a sacrifice. And this law is not like other liabilities for excision [when volitional and a sacrifice when inadvertent] in the Torah. As with other excisions - once he knows at the end, even if did not know at the beginning, he is liable for a sacrifice. And the verse determines to judge like this here, as it is written about the impurity of the Temple and its consecrated [foods] (Leviticus 5:2), "and it was hidden from him" - [which] implies that there was a time of awareness at the beginning; and afterwards it is stated, "and he knew." Behold, you have learned that that it needs awareness at the beginning and awareness at the end and hiddenness in the middle. But with other [instances of those] that are liable for excisions, it is written (Leviticus 4:27-28), "in his doing one of the commandments of the Lord which shall not be done, etc. Or his sin is made known to him" - meaning to say, once he knew at the end, even if he did not know at the beginning. As behold, it is not written there, "and it was hidden," from which we would learn awareness at the beginning.