A Jewish-owned store that did not sell its chometz to a non-Jew for Pesach
The Torah forbids a Jew to own chometz on Pesach. In order to dissuade people from owning chometz on Pesach, there is a rabbinic injunction not to eat or benefit after Pesach from chometz which was owned by a Jew during Pesach. Such chometz is known as chometz sheovar olov haPesach, and it remains forbidden permanently.1
For this reason, one should not buy chometz from a Jewish-owned store immediately after Pesach, unless the owner sold all chometz that he owned before Pesach to a non-Jew for the duration of Pesach, and did not acquire any further chometz during Pesach. The laws of mechiras chometz (selling chometz to a gentile for Pesach) are complex; therefore the sale must be made by a competent rabbi or kashrus authority.
If a Jewish-owned store did not sell its chometz for Pesach, may one […]