Sefer HaChinuch ספר החינוך

The commandment of disposing of chamets: To remove all leavened bread from our dwellings on the fourteenth day of Nissan, as it is stated (Exodus 12:15), “but on the first day, you shall dispose of leaven from your homes” — and the understanding of “first” is before Pesach.

It is from the roots of this commandment [that it is] in order that we should remember the miracles in Egypt, as it is written with the Pesach sacrifice (Sefer HaChinukh 5).

The laws of this commandment — for example what time of the day is its destruction; what is its disposal (Pesachim 21a); in which place one needs to search for it (Pesachim 5a) and in which place one does not need; from when the commandment is incumbent upon him if he goes on the road (Pesachim 6a); how is its law if the fourteenth of Nissan falls out on Shabbat (Pesachim 49a); the oral negation that he needs to do in addition to the destruction (Pesachim 6b); and the rest of its details — are [all] elucidated in [the] first [section of] Pesach[im]. (See Tur, Orach Chaim 431-440.)

And this commandment is practiced in every place and at all times by males and females. And one who transgresses it and does not dispose of [his chamets], has violated the commandment of “you shall dispose of [leaven].” And if there is chamets in his dwellings, he also transgresses a negative commandment — as it stated (Exodus 12:19), “leaven is not to be found in your homes.” But we do not administer lashes for this negative commandment, if he has not done an act — as it is the law that we do not administer lashes for a negative commandment that does not have an act [involved] with it.