Resh Lakish poses a question: What happens to a lulav - a palm branch - from a tree that has been worshipped? That is, in the event that it was planted to begin with in the name of idolatry. Does the use for a mitzvah make it more likely to be permitted? More likely to be forbidden? What about for regular use? Rav Dimi has a different understanding by which to answer Resh Lakish -- consider a tree that was planted for idolatry, and then that status was revoked. Now what, when it comes to mitzvot? Rav Pappa says there's no revocation (in other examples) when it comes to mitzvot. Also, new mishnayot! If one's home abuts the home of an idolater - divide the wall according to thickness. Note - the privacy of the bathroom. Plus, stones that were used to support idols vs. stones that had a covering that was connected to idolatry, and you removed any connection to idolatry....