Not to dirty one’s floor by the Shabbos meals:
It is proper to beware at the night and day meal from dirtying one’s floor by throwing food remnants onto it. Rather one is to throw the remnants onto the tablecloth which is on the table and after the meal one is to shake it [into the garbage] or outside of the house. If however one is accustomed to sweep the floor, in a permitted way, after each meal, then it is allowed to throw the remnants onto the floor.
 Lit. good. This is in contrast to the ruling of the Magen Avraham 262/1 which rules that it is forbidden to throw remnants on the floor if one does not plan on sweeping the floor immediately after the meal. Admur in Kuntrus Achron 1 proves that there is no prohibition involved and it is a mere matter of scrupulousness.
 The Darchei Moshe [brought in M”A 262/1] explains that the reason for this avoidance of dirtying the floor is due to that it may cause the escorting Shabbos angel to desire to leave the home.
 If however one only sweeps after the day meal, then one is to beware against dirtying the floor by the night meal. [ibid]