Charles Ingalls doesn't appear in this Season 7 episode.
The title is a quote from the Bible (Isaiah 1:18)
When the family gathers for the dinner in observance of Shabbat, Benjamin says he hopes the meat dish that Nellie prepared is not pork chops. Percival answers that it isn't, but a nice baked ham instead. Ham is pork, therefore Jewish people cannot eat it as pork is not kosher, and it wouldn't be served for Shabbat.
Mrs Oleson wears a dress at the Sabbath meal made from the same material as Laura Ingalls' dress for her first teaching job.